[Repo Assist] Add TypeScript output support and snapshot update mode to integration tests

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🤖 This is an automated pull request from Repo Assist, an AI assistant for this repository.

Closes #4022

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What

Extends the integration test framework with two improvements:

1. TypeScript compilation pass — any test case directory that contains *.tsx.expected files will now also be compiled with --lang typescript and the output compared against those files. This makes it straightforward to add TypeScript-specific snapshot tests.

2. Snapshot update mode — set UPDATE_SNAPSHOTS=true before running the integration tests and the runner will write actual output back to the *.expected files instead of asserting equality. This makes it easy to regenerate baselines after intentional output changes.

How

• Refactored the compile-and-compare logic into a private compileAndCheck helper that accepts an extension (.jsx / .tsx), a glob pattern for expected files, and a list of extra CLI args. Each language's pass calls this helper in sequence.
• Extended the normalize regex to strip version suffixes from both fable-library-js and fable-library-ts import paths (previously only fable-library-js was handled), so TypeScript expected files won't need updating on every library version bump.
• Old *.actual scratch files are cleaned up before each test run, same as before.

Adding a TypeScript test

Drop one or more *.tsx.expected files next to the existing *.jsx.expected files in a test case directory (e.g., tests/Integration/Integration/data/xmlComment/). The integration runner will automatically pick them up and compile + compare against them.

To create the initial expected files, run once with:

UPDATE_SNAPSHOTS=true ./build.sh test integration

Trade-offs

• The TypeScript compilation pass is skipped entirely when no *.tsx.expected files exist, so existing test cases have zero overhead.
• No new dependencies introduced.

Checklist

• Formatted with dotnet fantomas
• Changelog updated (src/Fable.Cli/CHANGELOG.md)
• CI validation (let CI run)

Note

🔒 Integrity filter blocked 70 items

The following items were blocked because they don't meet the GitHub integrity level.

• [Feature] Array2D operations #1764 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Is there a way to get attributes on a union case? #2026 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Reflection for classes #2027 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• StackOverflowException when compiling large match expression #2039 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Error doesn't show .fs line number #2052 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• IsUnion returns false for typeof<Option<int>> #2110 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Exceptions in async operations should be logged to the console #2137 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• DateTime.MinValue / DateTime.MaxValue ToString("yyyy-MM-dd") issues #2152 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Bug: System.DateTime.TryParse returns a inconsistent tuple (true, >"Invalid Date"<)  #2229 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Resolve System.Type.GetMethod(name) at compile time #2321 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Compile Error when referencing another project with EntryPoint #2366 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• simulate this Test Local Machine Timezone to fix this  #2375 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• StackOverflow with Fable but not with fsc in release #2392 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Inconsistencies with DateTime string formatting #2408 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• Recursive trait calls not working #2473 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• sorting a Resizearray differs from .NET #2506 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• ... and 54 more items

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