Backport: Expose merge request pipeline parameters for MR widget
What does this MR do?
What are the relevant issue numbers?
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary 
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Documentation created/updated via this MR 
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Documentation reviewed by technical writer or follow-up review issue created 
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Tests added for this feature/bug 
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Tested in all supported browsers 
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Conforms to the code review guidelines 
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Conforms to the merge request performance guidelines 
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Conforms to the style guides 
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Conforms to the database guides 
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Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process. 
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Security reports checked/validated by reviewer 
Edited  by Kamil Trzciński