Add import for SSM association

[ryndaniels]

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Closes #9981

Release note for CHANGELOG:

ENHANCEMENTS:
* resource/aws_ssm_association: Add import support

Output from acceptance testing:

$  make testacc TESTARGS="-run=TestAccAWSSSMAssociation_"
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./... -v -parallel 20 -run=TestAccAWSSSMAssociation_ -timeout 120m
?       github.com/terraform-providers/terraform-provider-aws   [no test files]
=== RUN   TestAccAWSSSMAssociation_basic
=== PAUSE TestAccAWSSSMAssociation_basic
=== RUN   TestAccAWSSSMAssociation_withTargets
=== PAUSE TestAccAWSSSMAssociation_withTargets
=== RUN   TestAccAWSSSMAssociation_withParameters
=== PAUSE TestAccAWSSSMAssociation_withParameters
=== RUN   TestAccAWSSSMAssociation_withAssociationName
=== PAUSE TestAccAWSSSMAssociation_withAssociationName
=== RUN   TestAccAWSSSMAssociation_withAssociationNameAndScheduleExpression
=== PAUSE TestAccAWSSSMAssociation_withAssociationNameAndScheduleExpression
=== RUN   TestAccAWSSSMAssociation_withDocumentVersion
=== PAUSE TestAccAWSSSMAssociation_withDocumentVersion
=== RUN   TestAccAWSSSMAssociation_withOutputLocation
=== PAUSE TestAccAWSSSMAssociation_withOutputLocation
=== RUN   TestAccAWSSSMAssociation_withScheduleExpression
=== PAUSE TestAccAWSSSMAssociation_withScheduleExpression
=== RUN   TestAccAWSSSMAssociation_withComplianceSeverity
=== PAUSE TestAccAWSSSMAssociation_withComplianceSeverity
=== RUN   TestAccAWSSSMAssociation_rateControl
=== PAUSE TestAccAWSSSMAssociation_rateControl
=== CONT  TestAccAWSSSMAssociation_basic
=== CONT  TestAccAWSSSMAssociation_rateControl
=== CONT  TestAccAWSSSMAssociation_withScheduleExpression
=== CONT  TestAccAWSSSMAssociation_withAssociationNameAndScheduleExpression
=== CONT  TestAccAWSSSMAssociation_withComplianceSeverity
=== CONT  TestAccAWSSSMAssociation_withParameters
=== CONT  TestAccAWSSSMAssociation_withAssociationName
=== CONT  TestAccAWSSSMAssociation_withOutputLocation
=== CONT  TestAccAWSSSMAssociation_withTargets
=== CONT  TestAccAWSSSMAssociation_withDocumentVersion
--- PASS: TestAccAWSSSMAssociation_withDocumentVersion (40.39s)
--- PASS: TestAccAWSSSMAssociation_withAssociationName (65.57s)
--- PASS: TestAccAWSSSMAssociation_withComplianceSeverity (65.59s)
--- PASS: TestAccAWSSSMAssociation_withAssociationNameAndScheduleExpression (65.60s)
--- PASS: TestAccAWSSSMAssociation_withScheduleExpression (65.65s)
--- PASS: TestAccAWSSSMAssociation_withParameters (68.74s)
--- PASS: TestAccAWSSSMAssociation_rateControl (70.42s)
--- PASS: TestAccAWSSSMAssociation_withTargets (90.95s)
--- PASS: TestAccAWSSSMAssociation_withOutputLocation (154.03s)
--- PASS: TestAccAWSSSMAssociation_basic (192.84s)
PASS
ok      github.com/terraform-providers/terraform-provider-aws/aws       199.581s

Local screenshot of docs changes:

[aeschright]

--- PASS: TestAccAWSSSMAssociation_withComplianceSeverity (31.12s)
--- PASS: TestAccAWSSSMAssociation_withDocumentVersion (35.09s)
--- PASS: TestAccAWSSSMAssociation_withAssociationNameAndScheduleExpression (37.72s)
--- PASS: TestAccAWSSSMAssociation_withTargets (44.24s)
--- PASS: TestAccAWSSSMAssociation_withParameters (44.28s)
--- PASS: TestAccAWSSSMAssociation_withScheduleExpression (44.67s)
--- PASS: TestAccAWSSSMAssociation_rateControl (47.41s)
--- PASS: TestAccAWSSSMAssociation_withOutputLocation (49.25s)
--- PASS: TestAccAWSSSMAssociation_withAssociationName (87.56s)
--- PASS: TestAccAWSSSMAssociation_basic (100.85s)

[ghost]

This has been released in version 2.29.0 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]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!