improv(metrics): emit warning when default dimensions are overwritten

[uttam282005]

Summary

Changes

This PR restores and improves the warning mechanism for overwritten default dimensions in the Metrics utility:

Key Updates:

• Introduced a static utility method suppressSetDefaultDimensionsWarnings() to temporarily suppress warnings during internal setDefaultDimensions() calls.
• Fixes a bug where calling captureColdStartMetric() would emit duplicate warnings for the service dimension.
• Refines warning behavior to only trigger when the overwritten service dimension is different from the internal default (i.e., truly user-defined).

Affected Code:

• metrics.ts (suppression logic added)
• dimension.test.ts (added tests covering the changes)
• captureColdStartMetric updated to wrap internal setDefaultDimensions call
• Constructor logic updated to avoid redundant warnings when values match

Issue number: closes #4134

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[dreamorosi]

I'll review this PR tomorrow, I am not 100% sure about wanting to add an internal flag but I need time to look at the code and come up with a proposal.

Please leave the PR open and, if possible, avoid making changes until we have time to review it.

Thank you!

[uttam282005]

sure.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[dreamorosi]

I need a bit more time - I've started looking at the PR and have made a couple commits to remove the static flag, but it needs some more work.

I'll continue by Monday end of day - please leave the PR open and if possible, avoid making changes to the code.