Fix NetworkCurl race on pipe close

[exposight]

ThreadSanitizer detected a data race on the pipe member between deinitializing thread making notification and the worker thread doing teardown. The solution is to perform both under the same lock to avoid race.

Relates-To: HERESDK-4984, OCMAM-772

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.40%. Comparing base (3496dd4) to head (5f74c47).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1719      +/-   ##
==========================================
+ Coverage   80.39%   80.40%   +0.01%     
==========================================
  Files         356      356              
  Lines       14294    14295       +1     
  Branches     1566     1565       -1     
==========================================
+ Hits        11491    11493       +2     
+ Misses       2174     2173       -1     
  Partials      629      629              

see 4 files with indirect coverage changes

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