feat(signals): infer and narrow EntityId type in withEntities

[Chiorufarewerin]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ngrx/platform/blob/main/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
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PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[X] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

Closes #4570

Does this PR introduce a breaking change?

[X] Yes
[ ] No

Additional info

I have already submitted this PR, but after further consideration, I came up with an alternative solution. I prefer this new approach because EntityId is more narrowly typed and properly inferred. However, it introduces breaking changes...

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