rds/option_group: Fix bad diffs with version and port

[YakDriver]

Description

Previously, on reading options back from AWS, version and port would be set even if they weren't configured. This PR changes that to check first if version and/or port is set in the configuration before setting the value from AWS.

This approach can be misleading in this scenario: a) version is set and applied, b) version is removed from the configuration. Diffs in version will not be checked. (The same would be true of port.) A practitioner may assume that removing the value will clear or remove the value from the AWS infrastructure. However, removing the value from configuration will instead just mean that Terraform will not detect diffs for version in the future.

Relations

Closes #21367

References

Output from Acceptance Testing

% make t T=TestAccRDSOptionGroup_ K=rds P=4
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/rds/... -v -count 1 -parallel 4 -run='TestAccRDSOptionGroup_'  -timeout 180m
=== RUN   TestAccRDSOptionGroup_basic
=== PAUSE TestAccRDSOptionGroup_basic
=== RUN   TestAccRDSOptionGroup_timeoutBlock
=== PAUSE TestAccRDSOptionGroup_timeoutBlock
=== RUN   TestAccRDSOptionGroup_namePrefix
=== PAUSE TestAccRDSOptionGroup_namePrefix
=== RUN   TestAccRDSOptionGroup_generatedName
=== PAUSE TestAccRDSOptionGroup_generatedName
=== RUN   TestAccRDSOptionGroup_optionGroupDescription
=== PAUSE TestAccRDSOptionGroup_optionGroupDescription
=== RUN   TestAccRDSOptionGroup_basicDestroyWithInstance
=== PAUSE TestAccRDSOptionGroup_basicDestroyWithInstance
=== RUN   TestAccRDSOptionGroup_Option_optionSettings
=== PAUSE TestAccRDSOptionGroup_Option_optionSettings
=== RUN   TestAccRDSOptionGroup_OptionOptionSettings_iamRole
=== PAUSE TestAccRDSOptionGroup_OptionOptionSettings_iamRole
=== RUN   TestAccRDSOptionGroup_sqlServerOptionsUpdate
=== PAUSE TestAccRDSOptionGroup_sqlServerOptionsUpdate
=== RUN   TestAccRDSOptionGroup_oracleOptionsUpdate
=== PAUSE TestAccRDSOptionGroup_oracleOptionsUpdate
=== RUN   TestAccRDSOptionGroup_OptionOptionSettings_multipleNonDefault
=== PAUSE TestAccRDSOptionGroup_OptionOptionSettings_multipleNonDefault
=== RUN   TestAccRDSOptionGroup_multipleOptions
=== PAUSE TestAccRDSOptionGroup_multipleOptions
=== RUN   TestAccRDSOptionGroup_tags
=== PAUSE TestAccRDSOptionGroup_tags
=== RUN   TestAccRDSOptionGroup_Tags_withOptions
=== PAUSE TestAccRDSOptionGroup_Tags_withOptions
=== RUN   TestAccRDSOptionGroup_badDiffs
=== PAUSE TestAccRDSOptionGroup_badDiffs
=== CONT  TestAccRDSOptionGroup_basic
=== CONT  TestAccRDSOptionGroup_sqlServerOptionsUpdate
=== CONT  TestAccRDSOptionGroup_tags
=== CONT  TestAccRDSOptionGroup_badDiffs
--- PASS: TestAccRDSOptionGroup_basic (31.33s)
=== CONT  TestAccRDSOptionGroup_OptionOptionSettings_multipleNonDefault
--- PASS: TestAccRDSOptionGroup_sqlServerOptionsUpdate (53.36s)
=== CONT  TestAccRDSOptionGroup_multipleOptions
--- PASS: TestAccRDSOptionGroup_badDiffs (64.79s)
=== CONT  TestAccRDSOptionGroup_Tags_withOptions
--- PASS: TestAccRDSOptionGroup_tags (72.11s)
=== CONT  TestAccRDSOptionGroup_optionGroupDescription
--- PASS: TestAccRDSOptionGroup_OptionOptionSettings_multipleNonDefault (50.33s)
=== CONT  TestAccRDSOptionGroup_OptionOptionSettings_iamRole
--- PASS: TestAccRDSOptionGroup_multipleOptions (29.61s)
=== CONT  TestAccRDSOptionGroup_Option_optionSettings
--- PASS: TestAccRDSOptionGroup_optionGroupDescription (29.39s)
=== CONT  TestAccRDSOptionGroup_basicDestroyWithInstance
--- PASS: TestAccRDSOptionGroup_OptionOptionSettings_iamRole (39.78s)
=== CONT  TestAccRDSOptionGroup_oracleOptionsUpdate
--- PASS: TestAccRDSOptionGroup_Tags_withOptions (70.10s)
=== CONT  TestAccRDSOptionGroup_namePrefix
--- PASS: TestAccRDSOptionGroup_Option_optionSettings (53.10s)
=== CONT  TestAccRDSOptionGroup_generatedName
--- PASS: TestAccRDSOptionGroup_namePrefix (28.31s)
=== CONT  TestAccRDSOptionGroup_timeoutBlock
--- PASS: TestAccRDSOptionGroup_generatedName (27.88s)
--- PASS: TestAccRDSOptionGroup_oracleOptionsUpdate (52.41s)
--- PASS: TestAccRDSOptionGroup_timeoutBlock (26.21s)
--- PASS: TestAccRDSOptionGroup_basicDestroyWithInstance (637.95s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/rds	741.179s

[github-actions]

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[github-actions]

This functionality has been released in v5.18.0 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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