Replace generic shared example on merge request spec
What does this MR do and why?
This MR replaces the usages of the generic shared example 'a working graphql query'
in merge request spec with 'a working graphql query that returns no data'
and 'a working graphql query that returns data'
accordingly to make it clear what we are testing.
Related to #419768 (comment 1602674258)
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.