ds/efs_file_system: return error when filtering by tags returns results != 1

[anGie44]

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Closes #24031
Closes #23309
Closes #21642

Output from acceptance testing:

--- PASS: TestAccEFSFileSystemDataSource_nonExistent_fileSystemID (18.35s)
--- PASS: TestAccEFSFileSystemDataSource_nonExistent_tags (55.12s)
--- PASS: TestAccEFSFileSystemDataSource_id (55.58s)
--- PASS: TestAccEFSFileSystemDataSource_availabilityZone (59.63s)
--- PASS: TestAccEFSFileSystemDataSource_tags (62.36s)
--- PASS: TestAccEFSFileSystemDataSource_name (67.06s)

[ewbankkit]

LGTM 🚀.

% make testacc TESTS=TestAccEFSFileSystemDataSource_ PKG=efs ACCTEST_PARALLELISM=2
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/efs/... -v -count 1 -parallel 2 -run='TestAccEFSFileSystemDataSource_'  -timeout 180m
=== RUN   TestAccEFSFileSystemDataSource_id
=== PAUSE TestAccEFSFileSystemDataSource_id
=== RUN   TestAccEFSFileSystemDataSource_tags
=== PAUSE TestAccEFSFileSystemDataSource_tags
=== RUN   TestAccEFSFileSystemDataSource_name
=== PAUSE TestAccEFSFileSystemDataSource_name
=== RUN   TestAccEFSFileSystemDataSource_availabilityZone
=== PAUSE TestAccEFSFileSystemDataSource_availabilityZone
=== RUN   TestAccEFSFileSystemDataSource_nonExistent_fileSystemID
=== PAUSE TestAccEFSFileSystemDataSource_nonExistent_fileSystemID
=== RUN   TestAccEFSFileSystemDataSource_nonExistent_tags
=== PAUSE TestAccEFSFileSystemDataSource_nonExistent_tags
=== CONT  TestAccEFSFileSystemDataSource_id
=== CONT  TestAccEFSFileSystemDataSource_availabilityZone
--- PASS: TestAccEFSFileSystemDataSource_id (26.00s)
=== CONT  TestAccEFSFileSystemDataSource_nonExistent_tags
--- PASS: TestAccEFSFileSystemDataSource_availabilityZone (26.37s)
=== CONT  TestAccEFSFileSystemDataSource_nonExistent_fileSystemID
--- PASS: TestAccEFSFileSystemDataSource_nonExistent_fileSystemID (2.83s)
=== CONT  TestAccEFSFileSystemDataSource_name
--- PASS: TestAccEFSFileSystemDataSource_nonExistent_tags (26.56s)
=== CONT  TestAccEFSFileSystemDataSource_tags
--- PASS: TestAccEFSFileSystemDataSource_name (27.23s)
--- PASS: TestAccEFSFileSystemDataSource_tags (23.53s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/efs	85.291s

[github-actions]

This functionality has been released in v4.11.0 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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