"Save as" can cause "duplicate defined alias"

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### How are you using the lua-language-server?

Visual Studio Code Extension (sumneko.lua)

### Which OS are you using?

Windows

### What is the issue affecting?

Annotations

### Expected Behaviour

"Save as" should clear the cached aliases from the previous file (in the case of no workspace/folder)

### Actual Behaviour

With a new window with no workspace, when I used "save as" I noticed the aliases from the file were still being used, causing a conflict _duplicate defined alias_ with the newly named file. See repro steps.


### Reproduction steps

0. Start with a new window, no workspace, etc
1. Create a new file, e.g., "test.lua"
2. Add some code and save the file ( `--@alias id integer\n` )
3. "Save as" test_2.lua
4. (Optional) You may need to repeatedly "Save as" (e.g., test_3.lua) to trigger the bug, I couldn't 100% repro
5. Observe _Duplicate defined alias `id`_

Reload editor to clear error

### Additional Notes

This is an edge case, as typically you'd have an workspace or folder open (in which case 'save as' should keep the previous file cached also).

### Log File

_No response_

No source file or test is named. Start by reproducing the issue in the Visual Studio Code extension with a new window and no workspace, then trace the Save as handling and cached annotation aliases. Done means repeated Save as operations no longer report a duplicate defined alias, while preserving the stated workspace behavior.

Written by the indexing model from the issue text.