Add type annotation for snippet resolvers
What does this MR do?
In this MR we set the proper return type for snippet resolvers. It also address the comments in #281697 (closed)
Does this MR meet the acceptance criteria?
Conformity
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Changelog entry -
Code review guidelines -
Merge request performance guidelines -
Style guides -
Separation of EE specific content
Related to #281697 (closed)
Edited by Francisco Javier López (ex-Gitlab)