r/elasticache_user: wait for modifying/active state to avoid inconsistent result

[anGie44]

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Closes #20334

Output from acceptance testing:

--- PASS: TestAccAWSElasticacheUser_tags (100.89s)
--- PASS: TestAccAWSElasticacheUser_basic (110.82s)
--- PASS: TestAccAWSElasticacheUser_disappears (118.02s)
--- PASS: TestAccAWSElasticacheUser_update (285.83s)

[ewbankkit]

LGTM 🚀.

% make testacc TESTARGS='-run=TestAccAWSElasticacheUser_'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -count 1 -parallel 20 -run=TestAccAWSElasticacheUser_ -timeout 180m
go: downloading github.com/aws/aws-sdk-go v1.40.7
=== RUN   TestAccAWSElasticacheUser_basic
=== PAUSE TestAccAWSElasticacheUser_basic
=== RUN   TestAccAWSElasticacheUser_update
=== PAUSE TestAccAWSElasticacheUser_update
=== RUN   TestAccAWSElasticacheUser_tags
=== PAUSE TestAccAWSElasticacheUser_tags
=== RUN   TestAccAWSElasticacheUser_disappears
=== PAUSE TestAccAWSElasticacheUser_disappears
=== CONT  TestAccAWSElasticacheUser_basic
=== CONT  TestAccAWSElasticacheUser_disappears
=== CONT  TestAccAWSElasticacheUser_tags
=== CONT  TestAccAWSElasticacheUser_update
--- PASS: TestAccAWSElasticacheUser_basic (69.36s)
--- PASS: TestAccAWSElasticacheUser_tags (70.95s)
--- PASS: TestAccAWSElasticacheUser_disappears (74.78s)
--- PASS: TestAccAWSElasticacheUser_update (213.02s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	219.689s

[github-actions]

This functionality has been released in v3.52.0 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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