resource/aws_dms_endpoint: Updates S3 Endpoint tests for extra connection attributes

[gdavison]

Adds test to confirm that extra_connection_attributes is correctly updated for DMS Endpoints.

Output from Acceptance Testing

$ make testacc PKG=dms TESTS=TestAccDMSEndpoint_S3_

--- PASS: TestAccDMSEndpoint_S3_key (7.54s)
--- PASS: TestAccDMSEndpoint_S3_extraConnectionAttributes (30.56s)
--- PASS: TestAccDMSEndpoint_S3_SSEKMSKeyId (30.82s)
--- PASS: TestAccDMSEndpoint_S3_SSEKMSKeyARN (30.86s)
--- PASS: TestAccDMSEndpoint_S3_basic (46.08s)

[github-actions]

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[johnsonaj]

LGTM 🚀

$ make testacc PKG=dms TESTS=TestAccDMSEndpoint_S3_

==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/dms/... -v -count 1 -parallel 20 -run='TestAccDMSEndpoint_S3_'  -timeout 180m
=== RUN   TestAccDMSEndpoint_S3_basic
=== PAUSE TestAccDMSEndpoint_S3_basic
=== RUN   TestAccDMSEndpoint_S3_key
=== PAUSE TestAccDMSEndpoint_S3_key
=== RUN   TestAccDMSEndpoint_S3_extraConnectionAttributes
=== PAUSE TestAccDMSEndpoint_S3_extraConnectionAttributes
=== RUN   TestAccDMSEndpoint_S3_SSEKMSKeyARN
=== PAUSE TestAccDMSEndpoint_S3_SSEKMSKeyARN
=== RUN   TestAccDMSEndpoint_S3_SSEKMSKeyId
=== PAUSE TestAccDMSEndpoint_S3_SSEKMSKeyId
=== CONT  TestAccDMSEndpoint_S3_basic
=== CONT  TestAccDMSEndpoint_S3_SSEKMSKeyARN
=== CONT  TestAccDMSEndpoint_S3_SSEKMSKeyId
=== CONT  TestAccDMSEndpoint_S3_extraConnectionAttributes
=== CONT  TestAccDMSEndpoint_S3_key
--- PASS: TestAccDMSEndpoint_S3_key (14.08s)
--- PASS: TestAccDMSEndpoint_S3_SSEKMSKeyARN (45.89s)
--- PASS: TestAccDMSEndpoint_S3_extraConnectionAttributes (46.57s)
--- PASS: TestAccDMSEndpoint_S3_SSEKMSKeyId (46.65s)
--- PASS: TestAccDMSEndpoint_S3_basic (68.65s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/dms	72.337s

[github-actions]

This functionality has been released in v4.53.0 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. Thank you!

[github-actions]

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