language_models: Rename `handler` to `handle` in Bedrock provider (#34923)

This PR renames the `handler` field to `handle` on the
`BedrockLanguageModelProvider` and `BedrockModel` structs.

Release Notes:

- N/A
7f70325a93Marshall Bowers committed on 7/22/2025, 8:04:08 PM· committed by GitHubparentf3c332d
1 file changedLine totals unavailable