Ignore FS errors from stat() in some cases.

[ericsnowcurrently]

(for #9901)

The earlier FS code ignored errors in a couple of situations. Recent changes inadvertently stopped ignoring them. This change restores the earlier behavior (and adds logging of the errors).

• Pull request represents a single change (i.e. not fixing disparate/unrelated things in a single PR).
• Title summarizes what is changing.
• Has a news entry file (remember to thank yourself!).
• Appropriate comments and documentation strings in the code.
• Has sufficient logging.
• [ ] Has telemetry for enhancements.
• Unit tests & system/integration tests are added/updated.
• [ ] Test plan is updated as appropriate.
• [ ] package-lock.json has been regenerated by running npm install (if dependencies have changed).
• [ ] The wiki is updated with any design decisions/details.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
0 Code Smells

No Coverage information
0.0% Duplication

[codecov-io]

Codecov Report

Merging #10021 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #10021      +/-   ##
==========================================
+ Coverage   61.19%   61.21%   +0.02%     
==========================================
  Files         564      564              
  Lines       30147    30152       +5     
  Branches     4561     4561              
==========================================
+ Hits        18448    18458      +10     
+ Misses      10667    10659       -8     
- Partials     1032     1035       +3

Impacted Files	Coverage Δ
src/client/common/platform/fileSystem.ts	77.21% <100%> (+1.78%)	⬆️
src/client/constants.ts	80% <0%> (ø)	⬆️
src/client/sourceMapSupport.ts	80.43% <0%> (+2.17%)	⬆️
src/client/common/utils/platform.ts	76.47% <0%> (+5.88%)	⬆️

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