Verify already started protocol handlers

[grcevski]

Right now our protocol control logic looks for pieces of the buffer to identify whether something is HTTP, HTTP2, MySQL or Postgres. However, we can possibly have the situation where the first packet that came through identified a protocol, say HTTP, but then the new part of the packet somehow based on the contents looks like something else.

This PR ensures we skip other protocol detectors once we've identified that something is HTTP.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.42%. Comparing base (df1d5ae) to head (ee2fc00).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #832       +/-   ##
===========================================
+ Coverage   25.84%   55.42%   +29.57%     
===========================================
  Files         214      251       +37     
  Lines       19339    21400     +2061     
===========================================
+ Hits         4999    11861     +6862     
+ Misses      13774     8731     -5043     
- Partials      566      808      +242     

Flag	Coverage Δ
integration-test	23.26% <ø> (ø)
integration-test-arm	0.00% <ø> (ø)
integration-test-vm-${ARCH}-${KERNEL_VERSION}	0.00% <ø> (ø)
k8s-integration-test	2.77% <ø> (ø)
oats-test	0.00% <ø> (ø)
unittests	46.53% <ø> (?)

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[mmat11]

there's already some infrastructure in place for storing protocol info, see call_protocol_args_t->protocol_type or enum protocol_type
if we extend that enum to http/http2, the checks for other tcp protocols are already in place, see: https://github.com/open-telemetry/opentelemetry-ebpf-instrumentation/blob/main/bpf/generictracer/protocol_mysql.h#L205-L208

[grcevski]

I hit a failure on a test and I can see the problem, we delayed a request but there was nothing to push it to completion. I'm going to work on a PR to fix this.