Fix some issues for Alloy integration

[marctc]

This PR fixes some issues that makes integration with Alloy possible:

• Downgrade OTEL to v0.102.1
• Avoid duplicated registration of beyla_build_info metric.
• Add extra condition in Enabled function for process metrics.
• Fix SetDebugMode to effectively enable debug logger.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 41.66667% with 7 lines in your changes missing coverage. Please review.

Project coverage is 81.71%. Comparing base (ada2a72) to head (0e83618).
Report is 87 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/beyla/config.go	0.00%	5 Missing ⚠️
pkg/internal/imetrics/iprom.go	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1058      +/-   ##
==========================================
- Coverage   81.75%   81.71%   -0.05%     
==========================================
  Files         139      139              
  Lines       11297    11302       +5     
==========================================
- Hits         9236     9235       -1     
- Misses       1543     1548       +5     
- Partials      518      519       +1     

Flag	Coverage Δ
integration-test	56.73% <41.66%> (+<0.01%)	⬆️
k8s-integration-test	58.87% <41.66%> (-0.07%)	⬇️
oats-test	37.00% <16.66%> (-0.02%)	⬇️
unittests	52.22% <25.00%> (-0.01%)	⬇️

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[grcevski]

LGTM!

[mariomac]

Looks good!