profiler: add process tags to profiling payloads

[rarguelloF]

What does this PR do?

Followup of #3566

Adds ProcessTags to profiling payloads.

Motivation

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.
• New code is free of linting errors. You can check this by running golangci-lint run locally.
• 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!

[nsrip-dd]

LGTM. For posterity, this format has been discussed in the following internal docs: 1, 2.

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-06-04 14:28:26

Comparing candidate commit 2a5e619 in PR branch rarguelloF/process-tags-profiling with baseline commit b7ba964 in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 21 metrics, 0 unstable metrics.