PMM-7 Move build-submodules script to monorepo (v3)

[ademidoff]

Same as #3184, but for v3.

• PMM-7 Move build scripts to monorepo Percona-Lab/jenkins-pipelines#2830

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 44.50%. Comparing base (5883e93) to head (607e35a).
Report is 1 commits behind head on v3.

Additional details and impacted files

@@            Coverage Diff             @@
##               v3    #3185      +/-   ##
==========================================
- Coverage   44.51%   44.50%   -0.01%     
==========================================
  Files         357      357              
  Lines       35594    35594              
==========================================
- Hits        15844    15842       -2     
- Misses      18127    18131       +4     
+ Partials     1623     1621       -2     

Flag	Coverage Δ
admin	11.47% <ø> (-0.06%)	⬇️
agent	52.66% <ø> (ø)
managed	46.65% <ø> (ø)
vmproxy	66.66% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.