Update and fix OTEL-collector and Tempo in OATS testing

[mariomac]

Automatically updating tempo breaks OATS testing. Trying to manually fix the failing PRs #776 and #808

There were many points of failure so, for simplicity, I've replaced all the moving pieces (collector+metrics+traces) by a single otel-lgtm instance. This also simplifies configuration.

[grcevski]

LGTM!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.39%. Comparing base (b0f1aca) to head (e4d3501).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #840      +/-   ##
==========================================
- Coverage   55.43%   55.39%   -0.04%     
==========================================
  Files         251      251              
  Lines       21390    21400      +10     
==========================================
- Hits        11857    11855       -2     
- Misses       8728     8734       +6     
- Partials      805      811       +6     

Flag	Coverage Δ
integration-test	23.13% <ø> (-0.14%)	⬇️
integration-test-arm	0.00% <ø> (ø)
k8s-integration-test	2.77% <ø> (-0.02%)	⬇️
oats-test	0.00% <ø> (ø)
unittests	46.53% <ø> (-0.01%)	⬇️

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[skl]

Nice