WIP: feat: enable orchestrion tracing with error stack traces

[hannahkm]

What does this PR do?

Adds a new orchestrion integration for error tracing.

Motivation

In order to enable using orchestrion to automatically trace error stack traces, we need to register the errortrace package as an integration. This builds upon #3709

Jira: LANGPLAT-160

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 ./scripts/lint.sh 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!

[hannahkm]

Open question: is this the best place for the orchestrion.yml file to exist? While we call this an "integration", what we are tracing is not a contrib but rather the product itself similar to profiling. For profiling, orchestrion.yml is in ./profiling, so maybe keeping this file in ./instrumentation/errortrace is an okay option.

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-08-07 21:29:03

Comparing candidate commit 5dab662 in PR branch hannahkm/update-errortrace with baseline commit 6ff12dc in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 24 metrics, 0 unstable metrics.

[kakkoyun]

Suggested change

	ctx := context.TODO()
	var span *tracer.Span
	span, _ = tracer.StartSpanFromContext(ctx, {{ printf "%q" .Function.Name }},
	tracer.Tag("function-name", {{ printf "%q" .Function.Name }}),
	)
	{{ $ctx := .Function.ArgumentOfType "context.Context" -}}
	var span *tracer.Span
	span, _ = tracer.StartSpanFromContext(ctx, {{ printf "%q" .Function.Name }},
	tracer.Tag("function-name", {{ printf "%q" .Function.Name }}),
	)

[darccio]

Out of curiosity, why are there so many modified go.mod files?