message: meta: Update 7.0.0-beta.2 CHANGELOG
diff: ## 7.0.0-beta.2
  +- **(breaking)** feat(tracing): Add empty baggage header propagation to outgoing requests (#5133)
  +- feat: Add attachments API (#5004)
  +- feat(core): Send Baggage in Envelope Header (#5104)
  +- feat(utils): Introduce Baggage API (#5066)
  - fix(build): Fix express import in `gcpfunction` (#5097)
  - fix(ember): Export sha hashes of injected scripts (#5089)
  +- ref(build): Use sucrase for es6 bundles (#5111)
  - ref(serverless): Do not throw on flush error (#5090)
  +- ref(serverless): Point DSN to relay in lambda extension (#5126)
  +- ref(tracing): Rename baggage env header to trace (#5128)
  ## 7.0.0-beta.1
  