[Performance] Optimize sanitizedHeadersOutput

[gonzaloriestra]

WHY are these changes introduced?

The sanitizedHeadersOutput function is called for every network request to format headers for logging. Even when debug logging is disabled, it performs expensive string manipulation and object iteration, which is unnecessary overhead.

WHAT is this pull request doing?

• Added an early return guard to skip sanitization when debug logging is disabled (!isVerbose() && !isUnitTest()).
• Extracted sensitive keywords into a module-level constant SENSITIVE_HEADERS to avoid repeated allocations.
• Refactored the sanitization loop to be more efficient using Object.entries and a single toLowerCase() call per header.

How to test your changes?

CI

Post-release steps

None.

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes
• I've considered analytics changes to measure impact
• The change is user-facing — I've identified the correct bump type (patch for bug fixes · minor for new features · major for breaking changes) and added a changeset with pnpm changeset add

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PR created automatically by Jules for task 1039541295515390170 started by @gonzaloriestra

[google-labs-jules]

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