Fix validation for CloudWatch event bus name

[kromol]

Now validation matches the pattern described in AWS docs. Slash
in names allows to create event buses associated with partner event
sources (where names might contain slashes), since both names should match.

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Closes #16431

Release note for CHANGELOG:

fix allowed pattern for EventBridge event bus name

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

...

[X010617]

I'd really like to see this get merged. The issue this fixes prevents any terraform integration with Event Bridge since the name of the event bus must match the name of the partner event source.

[guycushion]

this issue has just brought our TF upgrade to a halt, any chance this PR could get merged

[ghost]

This has been released in version 3.34.0 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!