feat(attributes): update several attributes to their lates OTel representation

[constantinius]

Description

OTel renamed several gen_ai attributes. This PR adds the new OTel-aligned names and deprecates the old Sentry names using the backfill strategy, per CONTRIBUTING.md.

Renames

Old (deprecated)	New
gen_ai.usage.output_tokens.reasoning	gen_ai.usage.reasoning.output_tokens
gen_ai.usage.input_tokens.cached	gen_ai.usage.cache_read.input_tokens
gen_ai.usage.input_tokens.cache_write	gen_ai.usage.cache_creation.input_tokens
gen_ai.response.time_to_first_token	gen_ai.response.time_to_first_chunk

Closes https://linear.app/getsentry/issue/TET-2415/deprecate-gen-aiusageinput-tokenscached

PR Checklist

• I have run yarn test and verified that the tests pass.
• I have run yarn generate to generate and format code and docs.

If an attribute was added:

• The attribute is in a namespace (e.g. nextjs.function_id, not function_id)
• I have used the correct value for pii (i.e. maybe or true. Use false only for values that should never be scrubbed such as IDs)

If an attribute was deprecated:

• I've followed the policies described in CONTRIBUTING.md

[github-actions]

Semver Impact of This PR

🟡 Minor (new features)

📋 Changelog Preview

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New Features ✨

Attributes

• Update several attributes to their lates OTel representation by constantinius in #418

• Add db.operation.batch.size by isaacs in #407
• Add app.vitals.start.prewarmed attribute by itaybre in #379
• Add and deprecate runtime context attributes by markushi in #383
• Add Android Runtime (ART) GC and memory attributes by markushi in #382
• Add db.stored_procedure.name and ensure span name attribute consistency by Lms24 in #398
• Add Cloudflare SDK attributes by JPeer264 in #392

Other

• Add missing GCP and FaaS attributes by ericapisani in #403

Bug Fixes 🐛

• (attributes) Set pii: 'maybe' on faas string attributes by Lms24 in #415
• (cloudfare) Add missing visibility attributes by markushi in #408

Internal Changes 🔧

• (deps-dev) Bump vitest from 3.2.4 to 4.1.0 by dependabot in #409

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[linear-code]

TET-2415