NETOBSERV-1522 Add otel to pipeline builder

[jpinsonneau]

Description

This is just background code not requiring testing:

• add otel to pipeline builder
• unrelated readme update

Dependencies

n/a

Checklist

If you are not familiar with our processes or don't know what to answer in the list below, let us know in a comment: the maintainers will take care of that.

• Will this change affect NetObserv / Network Observability operator? If not, you can ignore the rest of this checklist.
• Is this PR backed with a JIRA ticket? If so, make sure it is written as a title prefix (in general, PRs affecting the NetObserv/Network Observability product should be backed with a JIRA ticket - especially if they bring user facing changes).
• Does this PR require product documentation?
  • If so, make sure the JIRA epic is labelled with "documentation" and provides a description relevant for doc writers, such as use cases or scenarios. Any required step to activate or configure the feature should be documented there, such as new CRD knobs.
• Does this PR require a product release notes entry?
  • If so, fill in "Release Note Text" in the JIRA.
• Is there anything else the QE team should know before testing? E.g: configuration changes, environment setup, etc.
  • If so, make sure it is described in the JIRA ticket.
• QE requirements (check 1 from the list):
  • Standard QE validation, with pre-merge tests unless stated otherwise.
  • Regression tests only (e.g. refactoring with no user-facing change).
  • No QE (e.g. trivial change with high reviewer's confidence, or per agreement with the QE team).

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 21 lines in your changes missing coverage. Please review.

Project coverage is 66.28%. Comparing base (6f7ae99) to head (4ccec33).
Report is 2 commits behind head on main.

❗ Current head 4ccec33 differs from pull request most recent head 56a8aa7

Please upload reports for the commit 56a8aa7 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #672      +/-   ##
==========================================
- Coverage   66.49%   66.28%   -0.21%     
==========================================
  Files         104      104              
  Lines        6658     6679      +21     
==========================================
  Hits         4427     4427              
- Misses       1916     1937      +21     
  Partials      315      315              

Flag	Coverage Δ
unittests	66.28% <0.00%> (-0.21%)	⬇️

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

Files	Coverage Δ
pkg/config/stage_params.go	72.22% <0.00%> (-14.45%)	⬇️
pkg/config/pipeline_builder.go	58.76% <0.00%> (-10.75%)	⬇️

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