PMM-14889 Rollback MongoDb driver to v1 for RTA agent

[maxkondr]

• Adjust unit tests
• add Agent GitHub steps to build PMM Agent with GSSAPI support

PMM-14889

Link to the Feature Build: SUBMODULES-14889

[codecov]

Codecov Report

❌ Patch coverage is 88.37209% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.61%. Comparing base (aa10429) to head (07bf26a).
⚠️ Report is 1 commits behind head on v3.

Files with missing lines	Patch %	Lines
...ent/agents/mongodb/realtimeanalytics/connection.go	0.00%	3 Missing ⚠️
...agents/mongodb/realtimeanalytics/parser/helpers.go	94.28%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               v3    #5103      +/-   ##
==========================================
+ Coverage   46.53%   46.61%   +0.08%     
==========================================
  Files         392      392              
  Lines       40114    40135      +21     
==========================================
+ Hits        18666    18709      +43     
+ Misses      19596    19572      -24     
- Partials     1852     1854       +2     

Flag	Coverage Δ
admin	17.89% <ø> (ø)
agent	53.29% <88.37%> (+0.33%)	⬆️
managed	47.56% <ø> (-0.01%)	⬇️
vmproxy	72.09% <ø> (ø)

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[ademidoff]

FYI: I tried to increase the code coverage by creating tests for helpers.