Introduce Turborepo, changesets, and unified CI and publishing for packages
>>> [!note] Migrated issue
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<!-- Migrated from issue #3566545. -->
Reported by: [effulgentsia](https://www.drupal.org/user/78040)
Related to !556 !492
>>>
<p>Follow-up to <span class="drupalorg-gitlab-issue-link drupalorg-gitlab-link-wrapper"><a href="https://git.drupalcode.org/project/canvas/-/work_items/3562026" class="drupalorg-gitlab-link">https://git.drupalcode.org/project/canvas/-/work_items/3562026</a></span> which stopped short of the turborepo setup to make the MR scope manageable. This issue is for completing that part. See that issue summary for context.</p>
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