feat(attributes): Add app.vitals.start.prewarmed attribute

[itaybre]

Summary

• Adds new boolean attribute app.vitals.start.prewarmed indicating whether an app start was prewarmed
• Currently only available for sentry.cocoa

Test plan

• yarn test passes (5164 JS tests, 3 Python tests)
• yarn run generate produces correct JS/Python output

🤖 Generated with Claude Code

[github-actions]

Semver Impact of This PR

🟡 Minor (new features)

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New Features ✨

Attributes

• Add app.vitals.start.prewarmed attribute by itaybre in #379

• Add calculated performance scores by loewenheim in #355
• Add rpc.response.status_code attribute by alexander-alderman-webb in #352
• Add rpc.method attribute by alexander-alderman-webb in #351
• Add app vitals start attributes by buenaflor in #353
• Add process.runtime.engine.* attributes by chargome in #347

Bug Fixes 🐛

Attributes

• Increase some PII values by loewenheim in #373
• Change several deprecation statuses to normalize to align with ingestion paths by constantinius in #350

Other

• (create) Replace angle brackets in file names by loewenheim in #356

Internal Changes 🔧

• (gh) Remove myself from CODEOWNERS by lcian in #354
• Bump vulnerable js packages by chargome in #359

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