Remove TLS loading and replace with OTEL configtls

[yurishkuro]

Which problem is this PR solving?

• Resolves [Bug]: race condition when reloading TLS certificates #4316
• The last places where racy TLS cert loading code was used

Description of the changes

• Remove our custom logic for loading certificates
• Fully rely on configtls module from otel-collector

How was this change tested?

• CI

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.02%. Comparing base (737be78) to head (935f76a).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6345      +/-   ##
==========================================
- Coverage   96.07%   96.02%   -0.05%     
==========================================
  Files         358      356       -2     
  Lines       20477    20313     -164     
==========================================
- Hits        19673    19506     -167     
- Misses        613      615       +2     
- Partials      191      192       +1     

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unittests	94.89% <100.00%> (-0.06%)	⬇️

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[yurishkuro]

@chahatsagarmain thanks to your changes we can now remove this tls watcher that was causing race conditions.

[mahadzaryab1]

just a couple of nits

[mahadzaryab1]

lgtm