r/iam_role - add plan time validations

[DrFaust92]

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Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccAWSIAMRole_'
--- PASS: TestAccAWSIAMRole_badJSON (19.51s)
--- PASS: TestAccAWSIAMRole_disappears (52.30s)
--- PASS: TestAccAWSIAMRole_policyBasicInlineEmpty (54.28s)
--- PASS: TestAccAWSIAMRole_basic (56.15s)
--- PASS: TestAccAWSIAMRole_namePrefix (58.30s)
--- PASS: TestAccAWSIAMRole_force_detach_policies (66.71s)
--- PASS: TestAccAWSIAMRole_policyOutOfBandAdditionIgnored_managedNonExistent (85.92s)
--- PASS: TestAccAWSIAMRole_policyOutOfBandAdditionRemoved_managedEmpty (90.30s)
--- PASS: TestAccAWSIAMRole_policyOutOfBandAdditionRemoved_inlineEmpty (91.42s)
--- PASS: TestAccAWSIAMRole_policyOutOfBandRemovalAddedBack_inlineNonEmpty (92.20s)
--- PASS: TestAccAWSIAMRole_tags (93.65s)
--- PASS: TestAccAWSIAMRole_policyOutOfBandAdditionRemoved_inlineNonEmpty (97.30s)
--- PASS: TestAccAWSIAMRole_MaxSessionDuration (98.48s)
--- PASS: TestAccAWSIAMRole_policyOutOfBandAdditionRemoved_managedNonEmpty (101.40s)
--- PASS: TestAccAWSIAMRole_policyOutOfBandRemovalAddedBack_managedNonEmpty (101.58s)
--- PASS: TestAccAWSIAMRole_testNameChange (111.15s)
--- PASS: TestAccAWSIAMRole_policyOutOfBandAdditionIgnored_inlineNonExistent (115.37s)
--- PASS: TestAccAWSIAMRole_basicWithDescription (111.60s)
--- PASS: TestAccAWSIAMRole_policyBasicManaged (134.77s)
--- PASS: TestAccAWSIAMRole_policyBasicInline (134.87s)
--- PASS: TestAccAWSIAMRole_PermissionsBoundary (171.22s)

[ewbankkit]

@DrFaust92 Thanks for the contribution 🎉 👏.
I included your changes in #20785.

[github-actions]

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