fix: added cbr_rule validation to only allow one item

[aamadeuss]

No description provided.

[aamadeuss]

/run pipeline

[ocofaigh]

        	Error Trace:	/__w/terraform-ibm-event-notifications/terraform-ibm-event-notifications/tests/pr_test.go:190
        	Error:      	Expected nil, but got: &fmt.wrapError{msg:"error setting workspace tar file: error finding the upload tar action: job <TAR_WORKSPACE_UPLOAD> not found in workspace - [ ensecupg-d4v (eu-de.workspace.ensecupg-d4v.b48c735d) ]", err:(*fmt.wrapError)(0xc000841d40)}
        	Test:       	TestRunSecurityEnforcedUpgradeDASolution
        	Messages:   	This should not have errored

Looking into this. Have reported internally in slack

[ocofaigh]

/run pipeline

[terraform-ibm-modules-ops]

🎉 This PR is included in version 2.10.9 🎉

The release is available on:

• GitHub release
• v2.10.9

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