bedrock: Fix empty tool input on project diagnostic in bedrock (#33369)

Bedrock [do not accept][1] `null` as a JSON value input for the tool
call when called back.

Instead of passing null, we will pass back an empty object, which is
accepted by API

Closes #33204

Release Notes:

- Fixed project diagnostic tool call for bedrock

[1]:
https://docs.aws.amazon.com/bedrock/latest/APIReference/API_runtime_ToolUseBlock.html
c6ff58675fVladimir Kuznichenkov committed on 6/25/2025, 11:28:36 AM· committed by GitHubparent1c6b471
1 file changedLine totals unavailable