Posts/Post Types: Introduced the 'item_trashed' default label

[James-Roberts]

Added the item_trashed default label to the get_default_labels() method.

This update adds the item_trashed default label to the get_default_labels() method. As per #25604 , this should allow #25563 to move forward now that the strings are translatable. Note: #25563 was reverted, pending this update to core.

Testing Instructions:

1. Manually apply the changes in #25563 to a local copy of the Gutenberg plugin.
2. Remove the if statement here.
3. Instead of noticeMessage = ${ postType.labels.singular_name } trashed.;, use noticeMessage = postType.labels.item_trashed;
4. Re-build Gutenberg - npm run build.
5. Open a post in the editor - On the Document settings pane, click on "Move to trash".
6. Voice Over should read "Post trashed" before redirecting.

Trac ticket: https://core.trac.wordpress.org/ticket/51387

[github-actions]

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[James-Roberts]

E2E test locally gives the following results:

Test Suites: 6 passed, 6 total
Tests:       15 passed, 15 total
Snapshots:   0 total
Time:        117.714 s, estimated 224 s

Would it be possible to re-run it?

[SergeyBiryukov]

Thanks for the PR! Merged in r55923.