GC BridgeTester test seems to be flaky on 9.0 on mono Windows

## Build Information
Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1475174
Build error leg or test failing: GC\\Features\\Bridge\\BridgeTester\\BridgeTester.cmd
Pull request: https://github.com/dotnet/runtime/pull/129407

## Error Message

**DO NOT USE JSON BELOW IF THIS IS A BUILD BREAK** otherwise build analysis will allow pull requests to merge that break the build worse. For a build break, do not use this issue form. Make a regular new issue.

Fill the error message using [step by step known issues guidance](https://github.com/dotnet/arcade/blob/main/Documentation/Build%20Analysis/KnownIssueJsonStepByStep.md).

```json
{
"ErrorMessage": "System.Exception: Bridge Test App failed execution",
"BuildRetry": false,
"ExcludeConsoleLog": false
}
```

```
BEGIN EXECUTION
"C:\h\w\A0CE08E7\p\corerun.exe" -p "System.Reflection.Metadata.MetadataUpdater.IsSupported=false" -p "System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization=true" BridgeTester.dll
Start test SetupFragmentation
[6/22/2026 11:10:36 AM] CrashLoop 1/4
[6/22/2026 11:10:36 AM] major fill done
[6/22/2026 11:10:37 AM] fragmentation done
[6/22/2026 11:10:38 AM] done spewing bridges
[6/22/2026 11:10:41 AM] CrashLoop 2/4
[6/22/2026 11:10:43 AM] major fill done
[6/22/2026 11:10:43 AM] fragmentation done
[6/22/2026 11:10:44 AM] done spewing bridges
SCCS count expected 580135 but got 629016
Bridge Test App returned -1073740791
System.Exception: Bridge Test App failed execution
at BridgeTester.RunTests()
at __GeneratedMainWrapper.Main()
Expected: 100
Actual: 101
END EXECUTION - FAILED
```

### Known issue validation
**Build: :mag_right:** https://dev.azure.com/dnceng-public/public/_build/results?buildId=1475174
**Error message validated:** `[System.Exception: Bridge Test App failed execution`]
**Result validation:** :white_check_mark: Known issue matched with the provided build.
**Validation performed at:** 6/23/2026 4:31:53 PM UTC

### Report

|Build|Repository|Test|Pull Request|
|---|---|---|---|
|[1557185](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1557185)|dotnet/runtime|[PayloadGroup0.WorkItemExecution](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1557185&view=ms.vss-test-web.build-test-results-tab&runId=42858878&resultId=115372)|dotnet/runtime#132159|
#### Summary
|24-Hour Hit Count|7-Day Hit Count|1-Month Count|
|---|---|---|
|0|0|1|