tile:adding summary tiles as extesnions

[gitcliff]

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• This PR has a title that briefly describes the work done including the ticket number. If there is a ticket, make sure your PR title includes a conventional commit label. See existing PR titles for inspiration.
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• My work includes tests or is validated by existing tests.

Summary

The PR is also addressing the similar issue of the lab-tiles-slot which will not be visible in the implementer tools UI when used below
in the value for ComponentContext.Provider as the UI viewer depends on the div that cannot be added because of how the Carbon components work. Implementers can add more tab extensions to this slot via the routes.js file configuration.

Screenshots

Related Issue

Other

[gitcliff]

cc @pirupius

[jabahum]

Thanks @gitcliff. how about if they are evenly spaced to fill up the extra space

[gitcliff]

Thanks @gitcliff. how about if they are evenly spaced to fill up the extra space

hello @jabahum i think this is caused by this Extension design ..
i have attached two screenshots below showing the generated mark-up difference between when Extensions are used and when not used...