[Repo Assist] fix: add //#region folding markers to language configuration

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Summary

Closes #2125

Adds //#region and //#endregion folding markers to release/language-configuration.json, enabling region-based code folding in F# files when Ionide is active.

Problem

VS Code's built-in folding correctly folds //#region blocks in standalone .fs files (where it uses its own token-based provider). However, once Ionide is active, FSAC's FoldingRangeProvider takes over and the built-in region markers stop working — there's no fold indicator in the gutter for //#region blocks.

Fix

Add the folding.markers section to release/language-configuration.json:

"folding": {
  "markers": {
    "start": "^\\s*\\/\\/#region\\b",
    "end": "^\\s*\\/\\/#endregion\\b"
  }
}

As of VS Code 1.76, the editor evaluates folding.markers from the language configuration alongside the LSP folding range provider rather than as a pure fallback. This means region markers declared here are honoured even when FSAC provides its own structural folding ranges — users get both structural fold points from FSAC and explicit //#region / //#endregion regions.

Users on VS Code < 1.76 will not see any regression: the change is purely additive and existing behaviour is unchanged on older versions.

Test Status

This is a JSON configuration file change — no build step required. Validated that the file remains syntactically valid JSON (python3 -m json.tool passes cleanly).

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