refactor:Update the prefix logic

[arya-girish-k]

Description

Refactored the code logic for prefix variable by adding default value for prefix and marked as required in catalog manifest.Also allowed prefix to be "" (empty string) for advanced users.
#11959

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Release notes content

Add the default value for prefix variable and mark as required in catalog manifest. Also allowed prefix to be "" (empty string ).

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[arya-girish-k]

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[arya-girish-k]

Please find the Test Reference
https://github.ibm.com/GoldenEye/issues/issues/11959#issuecomment-101564513

[arya-girish-k]

/run pipeline

[arya-girish-k]

/run pipeline