r/api_gateway_authorizer: set authorizer_credentials via PatchOperation on create for COGNITO_USER_POOLS type

[anGie44]

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Closes #16613

Release note for CHANGELOG:

resource/api_gateway_authorizer: ensure authorizer_credentials are set and read from API for "COGNITO_USER_POOLS" type

Output from acceptance testing before code change:

    TestAccAWSAPIGatewayAuthorizer_cognito_authorizerCredentials: resource_aws_api_gateway_authorizer_test.go:106: Step 1/2 error: Check failed: Check 1/4 error: aws_api_gateway_authorizer.test: Attribute 'authorizer_credentials' expected "arn:aws:iam::xxxxxxxxx:role/tf-acc-test-1110847447754337420-lambda", got ""
--- FAIL: TestAccAWSAPIGatewayAuthorizer_cognito_authorizerCredentials (11.45s)

Output from acceptance testing after code change:

--- PASS: TestAccAWSAPIGatewayAuthorizer_cognito_authorizerCredentials (18.99s)

[gdavison]

LGTM 🚀

--- PASS: TestAccAWSAPIGatewayAuthorizer_cognito (25.70s)
--- PASS: TestAccAWSAPIGatewayAuthorizer_authTypeValidation (57.67s)
--- PASS: TestAccAWSAPIGatewayAuthorizer_basic (58.51s)
--- PASS: TestAccAWSAPIGatewayAuthorizer_cognito_authorizerCredentials (124.54s)
--- PASS: TestAccAWSAPIGatewayAuthorizer_switchAuthorizerTTL (154.58s)
--- PASS: TestAccAWSAPIGatewayAuthorizer_switchAuthType (188.49s)
--- PASS: TestAccAWSAPIGatewayAuthorizer_disappears (236.62s)
--- PASS: TestAccAWSAPIGatewayAuthorizer_zero_ttl (412.29s)

[ghost]

This has been released in version 3.25.0 of the Terraform AWS provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template for triage. Thanks!

[ghost]

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