refactor: Use single quotes consistently in the files

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What does this MR do and why?

While reviewing another MR, I stumbled across the following files that redundantly use %q(...) and %{ ... } and also inconsistently in the file.

Altho as part of

refactor: Use single quotes consistently in the files

• Fixin redundant usage of %q(...) and %{ ... } in the rest api files

Changelog: other

🛠 with ❤ at Siemens

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MR Checklist (@gerardo-navarro)

• Changelog entry added, if necessary
• Documentation created/updated via this MR
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
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• Conforms to the style guides
• Conforms to the javascript style guides
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