Add environment variable option for language selection

[grcevski]

This is a follow-up PR to #1302. Based on the review comments, I've added a new environment variable option we can use to enable OBI to instrument all services built with specific programming language.

For example:

sudo OTEL_EBPF_AUTO_TARGET_LANGUAGE=nodejs ... bin/obi

Will instrument all applications on the host implemented in Node.js.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 43.58%. Comparing base (754e788) to head (b7f8bf1).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1331      +/-   ##
==========================================
- Coverage   43.58%   43.58%   -0.01%     
==========================================
  Files         305      305              
  Lines       32877    32879       +2     
==========================================
  Hits        14329    14329              
- Misses      17630    17631       +1     
- Partials      918      919       +1     

Flag	Coverage Δ
integration-test	21.48% <20.00%> (-0.02%)	⬇️
integration-test-arm	0.00% <0.00%> (ø)
integration-test-vm-x86_64-5.15.152	0.00% <0.00%> (ø)
integration-test-vm-x86_64-6.10.6	0.00% <0.00%> (ø)
k8s-integration-test	2.36% <0.00%> (-0.01%)	⬇️
oats-test	0.00% <0.00%> (ø)
unittests	44.37% <100.00%> (-0.01%)	⬇️

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