language_models: Store Bedrock credentials under `https://amazonaws.com` in the keychain (#25565)

This PR updates the Bedrock provider to store the AWS credentials under
`https://amazonaws.com` in the keychain.

Release Notes:

- N/A
21fc3c07b6Marshall Bowers committed on 2/25/2025, 3:32:27 PM· committed by GitHubparentc90f878
1 file changedLine totals unavailable