feat(common): add provideLocationMocks() function to provide Location mocks

[AndrewKushnir]

This commit adds the provideLocationMocks() function that returns mocks for the Location and LocationStrategy classes. This function can be used in tests to configure an environment where it's possible to fire simulated location events (helpful when testing Router configuration).

PR Type

What kind of change does this PR introduce?

• Feature

Does this PR introduce a breaking change?

• Yes
• No

[atscott]

We can remove this now as well: https://github.com/angular/angular/blob/main/packages/router/testing/src/provide_router_for_testing.ts

And then all references to that will have to do provideRouter(...), provideLocationMocks()

[AndrewKushnir]

@atscott thanks for the feedback, I've updated the PR to remove the provideRouterForTesting and use the new function instead.

@alxhub could you please review this PR when you get a chance (the PR is needed before v15 feature freeze).

[dylhunn]

reviewed-for: public-api

[AndrewKushnir]

Merge-assistance (cc @jessicajaniuk): this PR is ready for merge, but needs one more public-api approval. Could you please take a look when you get a chance? Thank you.

[jessicajaniuk]

reviewed-for: public-api

[jessicajaniuk]

This PR was merged into the repository by commit c0c7efa.

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