resource/aws_eks_addon: Add default tags support

[gdavison]

Adds default tags support for aws_eks_addon

Relates #7926
Relates #16972

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccAWSEksAddon_'

--- PASS: TestAccAWSEksAddon_defaultTags_providerAndResource_duplicateTag (50.46s)
--- PASS: TestAccAWSEksAddon_disappears (927.88s)
--- PASS: TestAccAWSEksAddon_defaultTags_updateToProviderOnly (994.27s)
--- PASS: TestAccAWSEksAddon_disappears_Cluster (1035.77s)
--- PASS: TestAccAWSEksAddon_ServiceAccountRoleArn (1061.19s)
--- PASS: TestAccAWSEksAddon_defaultTags_updateToResourceOnly (1111.52s)
--- PASS: TestAccAWSEksAddon_AddonVersion (1115.52s)
--- PASS: TestAccAWSEksAddon_defaultTags_providerAndResource_overlappingTag (1116.04s)
--- PASS: TestAccAWSEksAddon_ignoreTags (1148.55s)
--- PASS: TestAccAWSEksAddon_Tags (1153.86s)
--- PASS: TestAccAWSEksAddon_basic (1159.40s)
--- PASS: TestAccAWSEksAddon_defaultTags_providerAndResource_nonOverlappingTag (1204.30s)
--- PASS: TestAccAWSEksAddon_ResolveConflicts (1211.20s)
--- PASS: TestAccAWSEksAddon_defaultTags_providerOnly (1225.17s)
--- PASS: TestAccAWSEksAddon_defaultAndIgnoreTags (1239.23s)

[anGie44]

Looks great, just a small documentation note.

[ghost]

This has been released in version 3.38.0 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!

[github-actions]

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