Add support for auto detecting TCX

[rafaelroquetto]

Add a configuration option called BEYLA_BPF_TC_BACKEND=auto, which tells Beyla to query the underlying kernel for TCX support. If TCX is supported, Beyla will use that, falling back to TC/Netlink otherwise.

[codecov]

Codecov Report

Attention: Patch coverage is 71.15385% with 15 lines in your changes missing coverage. Please review.

Project coverage is 71.64%. Comparing base (bf091bb) to head (f8b07b6).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/internal/ebpf/tcmanager/tcmanager.go	68.75%	13 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1533      +/-   ##
==========================================
- Coverage   71.67%   71.64%   -0.04%     
==========================================
  Files         195      195              
  Lines       19409    19459      +50     
==========================================
+ Hits        13911    13941      +30     
- Misses       4823     4841      +18     
- Partials      675      677       +2     

Flag	Coverage Δ
integration-test	53.72% <71.15%> (-0.20%)	⬇️
k8s-integration-test	54.08% <71.15%> (-0.61%)	⬇️
oats-test	30.89% <1.92%> (-0.09%)	⬇️
unittests	47.26% <1.92%> (-0.13%)	⬇️

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[grcevski]

LGTM! Sweet!