Fixes for SQL detection and Go events handled by kprobes

[grcevski]

This PR fixes a few things:

1. The SQL parsing was too naive, now we attempt to extract the operation and table name before we decide we have a SQL statement.
2. We had a long standing issue with PID removal. Once a process terminates we'd remove the PID with our BlockPID API, but it would always fail, since the API was trying to determine the namespace in the PID filter code. This was never going to work, since at the time the /proc/ directory doesn't exist anymore. I changed the code to take the namespace as argument, which is known to us when we attach to a process.
3. Since the PID filter at eBPF time is now a bloom filter, to avoid collisions and losing processes, we could theoretically process events generated by Go by the kprobes. There could be bloom filter space collision and the PID can match. This will cause us to generate event from kprobes that's already handled by Go, which will not be filtered out, since the PID is actually valid. I added code to detect that kprobes see an event that was meant for kprobes.

Fixes #897

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 88.41463% with 19 lines in your changes missing coverage. Please review.

Project coverage is 77.90%. Comparing base (ef47785) to head (0099d44).
Report is 1 commits behind head on main.

Files	Patch %	Lines
pkg/internal/ebpf/common/http2grpc_transform.go	61.53%	3 Missing and 2 partials ⚠️
pkg/internal/ebpf/gokafka/gokafka.go	0.00%	4 Missing ⚠️
pkg/internal/ebpf/common/httpfltr_transform.go	33.33%	1 Missing and 1 partial ⚠️
pkg/internal/ebpf/common/pids.go	88.23%	2 Missing ⚠️
pkg/internal/ebpf/common/tcp_detect_transform.go	66.66%	1 Missing and 1 partial ⚠️
pkg/internal/ebpf/goredis/goredis.go	50.00%	2 Missing ⚠️
pkg/internal/exec/file.go	50.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #901      +/-   ##
==========================================
- Coverage   77.98%   77.90%   -0.09%     
==========================================
  Files         125      126       +1     
  Lines        9124     9136      +12     
==========================================
+ Hits         7115     7117       +2     
- Misses       1544     1549       +5     
- Partials      465      470       +5     

Flag	Coverage Δ
integration-test	54.15% <44.51%> (+0.26%)	⬆️
k8s-integration-test	58.77% <29.87%> (-0.26%)	⬇️
oats-test	36.97% <73.78%> (+0.03%)	⬆️
unittests	43.68% <56.09%> (-0.05%)	⬇️

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[mariomac]

Looks good!