Feat: bedrock iam authentication (#12020)

### What problem does this PR solve?

Feat: bedrock iam authentication #12008 

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

web/src/locales/en.ts

@@ -785,6 +785,8 @@ This auto-tagging feature enhances retrieval by adding another layer of domain-s
     },
     setting: {
       deleteModel: 'Delete model',
+      bedrockCredentialsHint:
+        'Tip: Leave Access Key / Secret Key blank to use AWS IAM authentication.',
       modelEmptyTip:
         'No models available. <br>Please add models from the panel on the right.',
       sourceEmptyTip: 'No data sources added yet. Select one below to connect.',