Changelog optimization

[geyslan]

1. Explain what the PR does

8cee7a2 perf(changelog): optimize enforceSizeBoundary
3bc61a8 chore(changelog): avoid unnecessary initialization

8cee7a2 perf(changelog): optimize enforceSizeBoundary

These optimizations make the enforceSizeBoundary function more
efficient across various scenarios, leading to overall better
performance while maintaining the same behaviour (*).

Running tool: /home/gg/.goenv/versions/1.22.4/bin/go test -benchmem
-run=^$ -tags ebpf
-bench ^(BenchmarkEnforceSizeBoundaryOld|BenchmarkEnforceSizeBoundary)$
github.com/aquasecurity/tracee/pkg/changelog -benchtime=100000000x

goos: linux
goarch: amd64
pkg: github.com/aquasecurity/tracee/pkg/changelog
cpu: AMD Ryzen 9 7950X 16-Core Processor

| Test Case              | Old (ns/op) | New (ns/op) |   (%)  |
|------------------------|-------------|-------------|--------|
| No change needed       | 1.446       | 1.434       |  0.83% |
| Trim excess duplicates | 30.18       | 21.97       | 27.21% |
| Remove oldest entries  | 27.29       | 21.39       | 21.60% |

Since enforceSizeBoundary is called by setAt, the performance
improvements will be reflected in the latter:

-bench ^(setAtOld|setAt)$

| Test Case          | Old (ns/op) | New (ns/op) |   (%)  |
|--------------------|-------------|-------------|--------|
| All Scenarios      | 1267        | 1163        | 8.21%  |
| Within Limit       | 1770        | 1747        | 1.30%  |

Tests were fixed and added to ensure the correctness of the
implementation. Benchmarks were also added to track the performance
improvements.

(*) The behaviour of the function is the same, but the implementation
fixes a bug that when coalescing duplicate values, the removal of the
oldest entry was not being done correctly. Instead of removing the
oldest entry, the function was removing the newest one.

2. Explain how to test it

3. Other comments

This is part of the proctree effort.

[geyslan]

Probably related: #3878

[rscampos]

LGTM, @geyslan just double check the setAt because couldn't run it here.

[geyslan]

LGTM, @geyslan just double check the setAt because couldn't run it here.

Finished (10000000x):

Running tool: /home/gg/.goenv/versions/1.22.4/bin/go test -benchmem -run=^$ -tags ebpf -bench ^Benchmark_setAt$ github.com/aquasecurity/tracee/pkg/changelog -benchtime=10000000x

goos: linux
goarch: amd64
pkg: github.com/aquasecurity/tracee/pkg/changelog
cpu: AMD Ryzen 9 7950X 16-Core Processor            
Benchmark_setAt/All_Scenarios-32         	10000000	      1187 ns/op	    1008 B/op	       7 allocs/op
Benchmark_setAt/Within_Limit-32          	10000000	      1586 ns/op	    2571 B/op	       8 allocs/op