* style: add `visibility` to tree expand triangles
- The purpose of this is so that Playwright can perform actionability checks on the tree items. This will make operations involving expanding tree items much easier to perform in e2e.
* feat(e2e): Add AppAction to expand the entire tree
* fix: wait for loading indicator
* test: add test for `expandEntireTree`
* test: update `expandEntireTree` and tree selectors
- Use dynamic aria-label for different tree implementations
- Get rid of CSS ids which are only for testing
- Update percy tree scope selector
* chore(lint): remove unused variable
* refactor(e2e): update tree locators
Co-authored-by: John Hill <john.c.hill@nasa.gov>
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