PMM-7 Remove old MongoDB versions from test matrix

[ShashankSinha252]

Remove old MongoDB versions from test matrix for agent.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.75%. Comparing base (abeacee) to head (cece2e6).
Report is 8 commits behind head on main.

❗ Current head cece2e6 differs from pull request most recent head 5c1fd06. Consider uploading reports for the commit 5c1fd06 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1169      +/-   ##
==========================================
+ Coverage   42.27%   42.75%   +0.48%     
==========================================
  Files         396      384      -12     
  Lines       50123    48344    -1779     
==========================================
- Hits        21188    20669     -519     
+ Misses      26935    25724    -1211     
+ Partials     2000     1951      -49     

Flag	Coverage Δ
admin	10.45% <ø> (-1.11%)	⬇️
agent	52.79% <ø> (-0.54%)	⬇️
managed	43.89% <ø> (+1.08%)	⬆️
vmproxy	68.57% <ø> (ø)

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[BupycHuk]

can we add mongodb 6.0 as well?

[BupycHuk]

@ShashankSinha252 tests are failing for MongoDB 5.0

[ShashankSinha252]

@BupycHuk , took a look at it. Looks like an issue with explain actions for MongoDB with v5.0. I'll investigate it further in some time.