Remove unnecessary ExclusiveLeaseHelpers from spec

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What does this MR do and why?

The ExclusiveLeaseHelpers are not necessary in theses specs.

This is a follow-up to these two issues: #457518 (closed) #457512 (closed)

🛠 with ❤ at Siemens

MR acceptance checklist

MR Checklist ( @nwittstruck)

• 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
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the javascript style guides
• Conforms to the database guides

Related to #457518 (closed)