<!-- Thank you for your contribution! -->
<!-- Unless your change is trivial, please create an issue to discuss the change before creating a PR -->

## Change Summary

This PR fixes #7840: now different specifications of a generic TypeAliasType produce different definitions in pydantic schema which prevents "overwrites" of other specifications with the same origin.

## Related issue number

<!-- WARNING: please use "fix #123" style references so the issue is closed when this PR is merged. -->
* Fix #7840 

## Checklist

* [x] The pull request title is a good summary of the changes - it will be used in the changelog
* [x] Unit tests for the changes exist
* [x] Tests pass on CI
* [x] Documentation reflects the changes where applicable
* [x] My PR is ready to review, **please add a comment including the phrase "please review" to assign reviewers**


Selected Reviewer: @sydney-runkle
Make generic TypeAliasType specifications produce different schema definitions. <!-- Thank you for your contribution! -->
<!-- Unless your change is trivial, please create an issue to discuss the change before creating a PR -->

## Change Summary

This PR fixes #7840: now different specifications of a generic TypeAliasType produce different definitions in pydantic schema which prevents "overwrites" of other specifications with the same origin.

## Related issue number

<!-- WARNING: please use "fix #123" style references so the issue is closed when this PR is merged. -->
* Fix #7840 

## Checklist

* [x] The pull request title is a good summary of the changes - it will be used in the changelog
* [x] Unit tests for the changes exist
* [x] Tests pass on CI
* [x] Documentation reflects the changes where applicable
* [x] My PR is ready to review, **please add a comment including the phrase "please review" to assign reviewers**


Selected Reviewer: @sydney-runkle
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