DM-38858: Avoid resetting the sessions unnecessary to prevent leaking socket descriptors

[airnandez]

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

Patch coverage: 60.00% and project coverage change: -0.10 ⚠️

Comparison is base (51de4dd) 85.84% compared to head (6267d5e) 85.74%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
- Coverage   85.84%   85.74%   -0.10%     
==========================================
  Files          27       27              
  Lines        3836     3838       +2     
  Branches      789      791       +2     
==========================================
- Hits         3293     3291       -2     
- Misses        426      428       +2     
- Partials      117      119       +2     

Impacted Files	Coverage Δ
python/lsst/resources/http.py	80.39% <60.00%> (-0.65%)	⬇️

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[timj]

This looks okay. I need to think a bit more how this leaked in a situation where there was no forked subprocess.

[airnandez]

I added more details in JIRA to keep a record of this bug.