refactor: Remove unused parts of old metrics implementation

[emily-shen]

removes sendMetricsEvents across the codebase, metrics headers on deploy and dispatcher.identify

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• Public documentation
  • TODO (before merge)
  • Cloudflare docs PR(s):
  • Documentation not necessary because:

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---

wrangler@3.87.0 includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	3.20241106.0
workerd	1.20241106.1	1.20241106.1
workerd --version	1.20241106.1	2024-11-06

Please ensure constraints are pinned, and miniflare/workerd minor versions match.