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).

This is a backport of #10021.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!

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

No Coverage information
No Duplication information

[codecov-io]

Codecov Report

Merging #10032 into release-2020.02 will increase coverage by 0.01%.
The diff coverage is 100%.

@@                 Coverage Diff                 @@
##           release-2020.02   #10032      +/-   ##
===================================================
+ Coverage             61.2%   61.22%   +0.01%     
===================================================
  Files                  564      564              
  Lines                30083    30088       +5     
  Branches              4551     4551              
===================================================
+ Hits                 18411    18420       +9     
+ Misses               10642    10636       -6     
- Partials              1030     1032       +2

Impacted Files	Coverage Δ
src/client/common/platform/fileSystem.ts	77.87% <100%> (+1.78%)	⬆️
src/client/common/utils/platform.ts	76.47% <0%> (ø)	⬆️
src/client/linters/pydocstyle.ts	88.88% <0%> (ø)	⬆️
src/client/datascience/debugLocationTracker.ts	78.12% <0%> (ø)	⬆️
src/client/common/process/proc.ts	15.21% <0%> (ø)	⬆️
src/client/sourceMapSupport.ts	80.43% <0%> (+2.17%)	⬆️

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