[fs24-chrter]

⚠️ Pre Checklist

Please complete ALL items in this checklist, and remove before submitting

• I have read through the Contributing Documentation.
• I have added relevant tests.
• I have added relevant documentation.
• I will add labels to the PR, such as pr-type/bug-fix, pr-type/feature-development, etc.

Summary

This PR fixes GitHub bots being incorrectly classified as human accounts when collecting data through REST and GraphQL.

• GraphQL: Requests __typename to distinguish bots from users reliably. Previously, the decoder could populate both fragments and cause bots to be treated as users.
• REST: Adds [bot] to usernames when GitHub explicitly returns type: "Bot", including aliases such as Copilot. This preserves bot detection during account conversion.
• Across repositories: Keeps bot classification intact when different repositories and collection methods update the same account, using its numeric GitHub ID.
• Regression coverage: Adds unit and end-to-end tests for decoder behavior, REST aliases, historical data, and repeated conversion across repositories.

Does this close any open issues?

Closes #9385