[configtls] Deprecate *Context funcs

[TylerHelmuth]

Works towards #9811

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 91.77%. Comparing base (7469f38) to head (d5cb791).

Files	Patch %	Lines
config/configtls/configtls.go	33.33%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9945      +/-   ##
==========================================
- Coverage   91.80%   91.77%   -0.03%     
==========================================
  Files         358      358              
  Lines       16568    16568              
==========================================
- Hits        15210    15206       -4     
- Misses       1034     1038       +4     
  Partials      324      324              

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[TylerHelmuth]

Depends on open-telemetry/opentelemetry-collector-contrib#32332

[codeboten]

Needs a rebase