Add OSSF Best Practices badge

[artemgavrilov]

PMM-7

This PR adds OSSF best practices badge, I filled some fields in the form here: https://www.bestpractices.dev/en/projects/9702
But it still requires some efforts to complete it

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.07%. Comparing base (815c7ef) to head (d715df6).
Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3303      +/-   ##
==========================================
+ Coverage   42.04%   42.07%   +0.03%     
==========================================
  Files         399      399              
  Lines       50722    50722              
==========================================
+ Hits        21325    21341      +16     
+ Misses      27389    27371      -18     
- Partials     2008     2010       +2     

Flag	Coverage Δ
admin	11.59% <ø> (+0.04%)	⬆️
agent	51.98% <ø> (+0.12%)	⬆️
managed	42.79% <ø> (ø)
vmproxy	68.57% <ø> (ø)

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