Add test case verifying metric capture in Setup() lifecycle method

[kragent66-glitch]

Hi!

This PR adds a test case to to clarify how metrics can be captured during the lifecycle method of a .

Background

I investigated BEAM-27038 and found that the behavior of metrics in is tied to how the Go SDK handles context.

• If the method accepts a argument, the framework correctly passes the bundle's context, and metrics are captured.
• If the method does not accept context, any metrics incremented using are correctly (but perhaps unexpectedly) dropped.

Changes

• Added to verify that metrics are captured when accepts context.
• Added to verify the expected behavior when does not accept context.

This PR aims to serve as a documentation-by-test for this convention.

Thanks!

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