MkDev11 fe6125d8d1 [2.x] feat: Cache failed compilation to avoid repeated failures (#8490)
When a compilation fails with CompileFailed, the failure is now cached
so that subsequent builds with the same inputs don't re-run the failed
compilation. This significantly improves the experience when using BSP
clients like Metals that may trigger many compilations in a row.

The implementation:
- Adds CachedCompileFailure, CachedProblem, and CachedPosition types
  to serialize compilation failures
- Modifies ActionCache.cache to catch CompileFailed exceptions and
  store them in the cache with exitCode=1
- On cache lookup, checks for cached failures first and re-throws
  the cached exception if found
- Fixes DiskActionCacheStore.put to preserve exitCode from request
- Adds unit test to verify cached failure behavior

Fixes #7662
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