Add BackToImpersonator if not added for blazor #21353
BackDescription
Resolves #4117
Blazor apps were using pre-added menu item from this section:
#L46-L52
But in Blazor WebApp, that menu isn't merged. So, Blazor Menu contributor checks and adds it if not added now.
Checklist
- I fully tested it as developer / designer and created unit / integration tests
- I documented it (or no need to document or I will create a separate documentation issue)
- I worked with the design team to get their idea for UI/UX design (or no need to design for this PR)
- I've assigned reviewer, related labels and set a milestone for this PR
How to test it?
- Create a local reference new web-app tiered solution