GCEMetadataScripts.exe crashes when trying to install pipx

## Reproduction
Create a Windows Server VM with a `windows-startup-script-ps1` which contains the following:
```ps1
Set-ExecutionPolicy Bypass -Scope Process -Force
[System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072
iex ((New-Object System.Net.WebClient).DownloadString('https://community.chocolatey.org/install.ps1'))
Set-ExecutionPolicy Default -Scope Process

C:\ProgramData\chocolatey\bin\choco.exe install -y python312
```

### Actual Output
```

# ... Installation of chocolatey removed from output

GCEMetadataScripts.exe: Chocolatey v2.2.2
GCEMetadataScripts.exe: Installing the following packages:
GCEMetadataScripts.exe: python312
GCEMetadataScripts.exe: By installing, you accept licenses for the packages.
Progress: Downloading KB2919355 1.0.20160915... 100%
GCEMetadataScripts.exe:
GCEMetadataScripts.exe: KB2919355 v1.0.20160915 [Approved]
GCEMetadataScripts.exe: KB2919355 package files install completed. Performing other installation steps.
GCEMetadataScripts.exe: Skipping installation because this hotfix only applies to Windows 8.1 and Windows Server 2012 R2.
GCEMetadataScripts.exe: The install of KB2919355 was successful.
GCEMetadataScripts.exe: Software install location not explicitly set, it could be in package or
GCEMetadataScripts.exe: default install location of installer.
Progress: Downloading KB2999226 1.0.20181019... 100%
GCEMetadataScripts.exe:
GCEMetadataScripts.exe: KB2999226 v1.0.20181019 [Approved]
GCEMetadataScripts.exe: KB2999226 package files install completed. Performing other installation steps.
GCEMetadataScripts.exe: Skipping installation because update KB2999226 does not apply to this operating system (Microsoft Windows Server 2022 Datacenter).
GCEMetadataScripts.exe: The install of KB2999226 was successful.
GCEMetadataScripts.exe: Software install location not explicitly set, it could be in package or
GCEMetadataScripts.exe: default install location of installer.
Progress: Downloading KB3035131 1.0.3... 100%
GCEMetadataScripts.exe:
GCEMetadataScripts.exe: KB3035131 v1.0.3 [Approved]
GCEMetadataScripts.exe: KB3035131 package files install completed. Performing other installation steps.
GCEMetadataScripts.exe: Skipping installation because update KB3035131 does not apply to this operating system (Microsoft Windows Server 2022 Datacenter).
GCEMetadataScripts.exe: The install of KB3035131 was successful.
GCEMetadataScripts.exe: Software install location not explicitly set, it could be in package or
GCEMetadataScripts.exe: default install location of installer.
Progress: Downloading KB3033929 1.0.5... 100%
GCEMetadataScripts.exe:
GCEMetadataScripts.exe: KB3033929 v1.0.5 [Approved]
GCEMetadataScripts.exe: KB3033929 package files install completed. Performing other installation steps.
GCEMetadataScripts.exe: Skipping installation because update KB3033929 does not apply to this operating system (Microsoft Windows Server 2022 Datacenter).
GCEMetadataScripts.exe: The install of KB3033929 was successful.
GCEMetadataScripts.exe: Software install location not explicitly set, it could be in package or
GCEMetadataScripts.exe: default install location of installer.
Progress: Downloading vcredist140 14.40.33810... 100%
GCEMetadataScripts.exe:
GCEMetadataScripts.exe: vcredist140 v14.40.33810 [Approved]
GCEMetadataScripts.exe: vcredist140 package files install completed. Performing other installation steps.
GCEMetadataScripts.exe: Downloading vcredist140-x86
GCEMetadataScripts.exe: from 'https://download.visualstudio.microsoft.com/download/pr/9c69db26-cda4-472d-bdae-f2b87f4a0177/A32DD41EAAB0C5E1EAA78BE3C0BB73B48593DE8D97A7510B97DE3FD993538600/VC_redist.x86.exe'
Progress: 100% - Completed download of C:\Windows\TEMP\chocolatey\vcredist140\14.40.33810\VC_redist.x86.exe (13.22 MB).
GCEMetadataScripts.exe: Download of VC_redist.x86.exe (13.22 MB) completed.
GCEMetadataScripts.exe: Hashes match.
GCEMetadataScripts.exe: Installing vcredist140-x86...
GCEMetadataScripts.exe: vcredist140-x86 has been installed.
GCEMetadataScripts.exe: Downloading vcredist140-x64 64 bit
GCEMetadataScripts.exe: from 'https://download.visualstudio.microsoft.com/download/pr/1754ea58-11a6-44ab-a262-696e194ce543/3642E3F95D50CC193E4B5A0B0FFBF7FE2C08801517758B4C8AEB7105A091208A/VC_redist.x64.exe'
Progress: 100% - Completed download of C:\Windows\TEMP\chocolatey\vcredist140\14.40.33810\VC_redist.x64.exe (24.22 MB).
GCEMetadataScripts.exe: Download of VC_redist.x64.exe (24.22 MB) completed.
GCEMetadataScripts.exe: Hashes match.
GCEMetadataScripts.exe: Installing vcredist140-x64...
GCEMetadataScripts.exe: vcredist140-x64 has been installed.
GCEMetadataScripts.exe: vcredist140 may be able to be automatically uninstalled.
GCEMetadataScripts.exe: The install of vcredist140 was successful.
GCEMetadataScripts.exe: Software installed as 'exe', install location is likely default.
Progress: Downloading vcredist2015 14.0.24215.20170201... 100%
GCEMetadataScripts.exe:
GCEMetadataScripts.exe: vcredist2015 v14.0.24215.20170201 [Approved]
GCEMetadataScripts.exe: vcredist2015 package files install completed. Performing other installation steps.
GCEMetadataScripts.exe: The install of vcredist2015 was successful.
GCEMetadataScripts.exe: Software installed to 'C:\ProgramData\chocolatey\lib\vcredist2015'
GCEMetadataScripts.exe: error while communicating with "windows-startup-script-ps1" script: bufio.Scanner: token too long
```

### Result

- Metadata Script logs error `GCEMetadataScripts.exe: error while communicating with "windows-startup-script-ps1" script: bufio.Scanner: token too long`
- Ends prematurely
- Not running any lines after the `choco install`.

### Expected result

- No error
- Continue running

The reason for this is probably because choco will try to overwrite the previous line (CR instead of CRLF) while printing progress lines.

### Detail

Here's an excerpt of what choco's output looks like when piped through `xxd`:

```
00003ce0: 5d0d 0a76 6372 6564 6973 7432 3031 3520 ]..vcredist2015
00003cf0: 7061 636b 6167 6520 6669 6c65 7320 696e package files in
00003d00: 7374 616c 6c20 636f 6d70 6c65 7465 642e stall completed.
00003d10: 2050 6572 666f 726d 696e 6720 6f74 6865 Performing othe
00003d20: 7220 696e 7374 616c 6c61 7469 6f6e 2073 r installation s
00003d30: 7465 7073 2e0d 0a20 5468 6520 696e 7374 teps... The inst
00003d40: 616c 6c20 6f66 2076 6372 6564 6973 7432 all of vcredist2
00003d50: 3031 3520 7761 7320 7375 6363 6573 7366 015 was successf
00003d60: 756c 2e0d 0a20 2053 6f66 7477 6172 6520 ul... Software
00003d70: 696e 7374 616c 6c65 6420 746f 2027 433a installed to 'C:
00003d80: 5c50 726f 6772 616d 4461 7461 5c63 686f \ProgramData\cho
00003d90: 636f 6c61 7465 795c 6c69 625c 7663 7265 colatey\lib\vcre
00003da0: 6469 7374 3230 3135 270d 0a0d 5072 6f67 dist2015'...Prog
00003db0: 7265 7373 3a20 446f 776e 6c6f 6164 696e ress: Downloadin
00003dc0: 6720 7079 7468 6f6e 3331 3220 332e 3132 g python312 3.12
00003dd0: 2e35 2e2e 2e20 250d 5072 6f67 7265 7373 .5... %.Progress
00003de0: 3a20 446f 776e 6c6f 6164 696e 6720 7079 : Downloading py
00003df0: 7468 6f6e 3331 3220 332e 3132 2e35 2e2e thon312 3.12.5..
00003e00: 2e20 250d 5072 6f67 7265 7373 3a20 446f . %.Progress: Do
00003e10: 776e 6c6f 6164 696e 6720 7079 7468 6f6e wnloading python
00003e20: 3331 3220 332e 3132 2e35 2e2e 2e20 250d 312 3.12.5... %.
00003e30: 5072 6f67 7265 7373 3a20 446f 776e 6c6f Progress: Downlo
00003e40: 6164 696e 6720 7079 7468 6f6e 3331 3220 ading python312
00003e50: 332e 3132 2e35 2e2e 2e20 250d 5072 6f67 3.12.5... %.Prog
00003e60: 7265 7373 3a20 446f 776e 6c6f 6164 696e ress: Downloadin
00003e70: 6720 7079 7468 6f6e 3331 3220 332e 3132 g python312 3.12
00003e80: 2e35 2e2e 2e20 250d 5072 6f67 7265 7373 .5... %.Progress
00003e90: 3a20 446f 776e 6c6f 6164 696e 6720 7079 : Downloading py
00003ea0: 7468 6f6e 3331 3220 332e 3132 2e35 2e2e thon312 3.12.5..
00003eb0: 2e20 250d 5072 6f67 7265 7373 3a20 446f . %.Progress: Do
00003ec0: 776e 6c6f 6164 696e 6720 7079 7468 6f6e wnloading python
00003ed0: 3331 3220 332e 3132 2e35 2e2e 2e20 250d 312 3.12.5... %.
00003ee0: 5072 6f67 7265 7373 3a20 446f 776e 6c6f Progress: Downlo
00003ef0: 6164 696e 6720 7079 7468 6f6e 3331 3220 ading python312
00003f00: 332e 3132 2e35 2e2e 2e20 250d 5072 6f67 3.12.5... %.Prog
00003f10: 7265 7373 3a20 446f 776e 6c6f 6164 696e ress: Downloadin
00003f20: 6720 7079 7468 6f6e 3331 3220 332e 3132 g python312 3.12
00003f30: 2e35 2e2e 2e20 250d 5072 6f67 7265 7373 .5... %.Progress
00003f40: 3a20 446f 776e 6c6f 6164 696e 6720 7079 : Downloading py
00003f50: 7468 6f6e 3331 3220 332e 3132 2e35 2e2e thon312 3.12.5..
00003f60: 2e20 250d 5072 6f67 7265 7373 3a20 446f . %.Progress: Do
00003f70: 776e 6c6f 6164 696e 6720 7079 7468 6f6e wnloading python
00003f80: 3331 3220 332e 3132 2e35 2e2e 2e20 250d 312 3.12.5... %.
00003f90: 5072 6f67 7265 7373 3a20 446f 776e 6c6f Progress: Downlo
00003fa0: 6164 696e 6720 7079 7468 6f6e 3331 3220 ading python312
00003fb0: 332e 3132 2e35 2e2e 2e20 250d 5072 6f67 3.12.5... %.Prog
```

You can see it uses `0d` (CR) to move the cursor back to the start of the line, not detecting that this is not an interactive terminal.
Still, this shouldn't break startup scripts.

A workaround is to just pipe the output to NUL.

The payload identifies GCEMetadataScripts.exe and the windows-startup-script-ps1 execution path, but no repository file or test. Start by tracing how the Go agent reads startup-script output and reproducing the Windows Server case with Chocolatey's carriage-return progress output. Done means the scanner no longer reports “token too long” and lines after choco install continue running.

Written by the indexing model from the issue text.