upgrade go-libddwaf & appsec-internal-go and remove occurences of go 1.20

[eliottness]

What does this PR do?

• Upgrade go-libddwaf and appsec-internal-go to their go1.21 version of the go.mod
• rollout 1.20 from the macrobenchmarks
• Remove unnecessary files and outdated build tags
• Upgrade gotraceui

Motivation

Housekeeping & Following the Go Support Policy

Reviewer's Checklist

• Changed code has unit tests for its functionality at or near 100% coverage.
• System-Tests covering this feature have been added and enabled with the va.b.c-dev version tag.
• There is a benchmark for any new code, or changes to existing code.
• If this interacts with the agent in a new way, a system test has been added.
• Add an appropriate team label so this PR gets put in the right place for the release notes.
• Non-trivial go.mod changes, e.g. adding new modules, are reviewed by @DataDog/dd-trace-go-guild.

Unsure? Have a question? Request a review!

[eliottness]

The parametric tests does not pass because this PR is blocked by DataDog/system-tests#2724

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-07-11 09:43:23

Comparing candidate commit 537b43a in PR branch eliott.bouhana/housekeeping with baseline commit 577c776 in branch main.

Found 2 performance improvements and 1 performance regressions! Performance is the same for 44 metrics, 0 unstable metrics.

scenario:BenchmarkHttpServeTrace-24

• 🟥 execution_time [+420.616ns; +497.184ns] or [+2.622%; +3.099%]

scenario:BenchmarkOTelApiWithCustomTags/datadog_otel_api-24

• 🟩 execution_time [-173.253ns; -149.147ns] or [-3.483%; -2.998%]

scenario:BenchmarkOTelApiWithCustomTags/otel_api-24

• 🟩 execution_time [-278.922ns; -233.878ns] or [-3.615%; -3.032%]

[nsrip-dd]

Thanks!!