[EPIC] Source Amplitude to Beta

[bazarnov]

The main purpose of this issue is to track release progress for the connector.

According to checklist:

• MLP improvements:

  • 🎉 Source Amplitude: Increase unit_test coverage up to 90% #12432

• All outstanding bug reports blocking Beta:

  • Source Amplitude: events not syncing properly #10220
  • Source Amplitude: add better response error msg to return error 400 reason file is too big #7900

• Label connector as Beta in cloud:

  • label Amplitude as beta in the UI https://github.com/airbytehq/airbyte-cloud/pull/1570
  • label Amplitude as beta in source_difinitions.yaml 🎉 Source Amplitude: set releaseStage to beta #12659

Acceptance criteria

• [] Create a checklist document that should be placed on the Google Drive
• Checklist filled up by engineering team
• Collect and list all tech debt-related issues in the section below
• Create/Revise MLP document and place it here
• Move checklist to the unblockers team
• Reviewed/Updated by unblockers team
• Move checklist to the product team for review
• Reviewed/Updated by product team
• Update connector documentation according to the comments in the checklist
• Certification completed

[bazarnov]

The Source Amplitude is now in Beta, this Epic is closed.