chore: add cache-busting to e2e tests and improve mysql2 base connection support

[sohankshirsagar]

Note

Broaden mysql2 instrumentation to support >=2.3.3<4.0.0 with version-aware patching and update tests, plus add cache-busting to e2e Dockerfiles and minor logging/docs tweaks.

• Instrumentation (mysql2):
  • Expand support to >=2.3.3 <4.0.0 with version-aware patching of connection, base/connection, pool, and pool_connection.
  • Refactor into helpers for prototype/class wrapping; skip redundant patches for v3 base.
  • Maintain create functions patching (mysql2/lib/create_connection.js, create_pool.js).
• Tests:
  • Update integration tests to expect mysql2.connection.query spans (vs poolConnection.query), adjust assertions/formatting.
  • Change cjs-mysql2 test app mysql2 dep to ^3.9.8.
• E2E Dockerfiles:
  • Add ARG CACHEBUST=1 to multiple e2e images (fetch, http, grpc, ioredis, mysql2, pg, postgres) to force fresh CLI download.
• Other:
  • Minor log/constant tweaks in http and ioredis instrumentation; add debug log for replay trace id; string style normalization.
  • Docs: retitle docs/nextjs-initialization.md to “Next.js Initialization (Beta)”.
  • Small formatting/quote updates (e.g., schema helper, docker-compose).

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