ddtrace/tracer: Add test to ensure global config inherits statsd address when configured with tracer.WithDogstatsdAddress

[mtoffl01]

What does this PR do?

Ensure that the address provided to the tracer via the WithDogstatsdAddress option is passed along to the globalconfig, for contribs to use. This includes a unix domain socket path.

Motivation

Cover a test case that was not previously covered

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.

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[pr-commenter]

Benchmarks

Benchmark execution time: 2024-05-09 20:52:54

Comparing candidate commit 847f047 in PR branch mtoff/dbstats-uds with baseline commit 3a426ca in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 43 metrics, 1 unstable metrics.

[github-actions]

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