feat(metric): remove cookie column from request attributes in Metric …

[ArnabChatterjee20k]

…class

[greptile-apps]

Greptile Summary

Removes the cookie request attribute from the event metric contract and generated schema.

• Updates the event-column allowlist and its documentation.
• Removes the cookie column from event schema generation.
• Updates the metric schema test expectation.

Confidence Score: 5/5

The PR appears safe to merge with no actionable correctness or security issues identified.

The removed dimension is updated consistently across the metric contract, generated schema, and tests, while existing database columns are tolerated by additive schema reconciliation.

Important Files Changed

Filename	Overview
src/Usage/Metric.php	Consistently removes cookie from the event dimension allowlist, documentation, and generated schema without disrupting existing schema reconciliation.
tests/Usage/MetricTest.php	Updates the expected event-column list to reflect the intentional removal of cookie.

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