Add new Data explorer page for groups and projects
What does this MR do and why?
Adds a new page at Analyze > Data Explorer for both groups and projects, when the analyze_data_explorer feature flag is enabled.
The page itself is still non-functional, but will render the existing data explorer component which will be expanded on in future MRs.
References
Screenshots or screen recordings
How to set up and validate locally
- Enable the 
analyze_data_explorerfeature flag - For any group, navigate to 
Analyze > Data explorerin the sidebar and validate that the page renders - Repeat the previous step for any project
 
MR acceptance checklist
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Related to #570016 (closed)
Edited  by Alex Pennells
