Add validation to ibm_logs_router_tenant for target name

[ocofaigh]

As per the Cloud Logs team:

The value for 'targets.name' is not valid. The value must be between 1 and 35 characters in length and can only contain these characters: ^[a-zA-Z][a-zA-Z0-9-]*$."

If you enter a value that does not comply with this, the provider does not fail. Instead the api returns with an error that is pretty useless:
'CreateTenantWithContext failed: Bad Request'

I already have an issue to improve that error message from the api, however regex validation should be added to the provider to ensure a better user experience and to also fail faster.

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Terraform CLI and Terraform IBM Provider Version

Affected Resource(s)

• ibm_logs_router_tenant

Terraform Configuration Files

Please include all Terraform configurations required to reproduce the bug. Bug reports without a functional reproduction may be closed without investigation.

# Copy-paste your Terraform configurations here - for large Terraform configs,
# please share a link to the ZIP file.

Debug Output

Panic Output

Expected Behavior

Actual Behavior

Steps to Reproduce

1. terraform apply

Important Factoids

References

• #0000