refactor(config) migrate agentURL

[mtoffl01]

What does this PR do?

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 ./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!

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-12-03 20:00:27

Comparing candidate commit 6075f08 in PR branch mtoff/migrate-agenturl with baseline commit e12fcf6 in branch mtoff/revamp-debug-api.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 15 metrics, 0 unstable metrics.

[datadog-datadog-prod-us1]

⚠️ Tests

⚠️ Warnings

🧪 1 Test failed

TestMain from github.com/DataDog/dd-trace-go/v2/ddtrace/tracer (Datadog)

Failed

PASS
coverage: 67.9% of statements
goleak: Errors on successful test run: found unexpected goroutines:
[Goroutine 142398 in state IO wait, with internal/poll.runtime_pollWait on top of the stack:
internal/poll.runtime_pollWait(0x7f42421c7eb0, 0x72)
	/opt/hostedtoolcache/go/1.24.11/x64/src/runtime/netpoll.go:351 +0x85
internal/poll.(*pollDesc).wait(0xc00039cda0, 0x72, 0x0)
	/opt/hostedtoolcache/go/1.24.11/x64/src/internal/poll/fd_poll_runtime.go:84 +0xb1
...

ℹ️ Info

❄️ No new flaky tests detected

_{This comment will be updated automatically if new data arrives.
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