Packages: Move unreleased changelog entries out of the 23.8 published versions

[sirreal]

Follow-up to #81485. The npm release backport was cherry-picked onto trunk while several changelog edits were in flight. Git auto-merged them textually and filed nine entries under the newly published version headings, in packages block-editor, block-library, components and dataviews.

None of the six PRs involved (#80747, #81292, #81361, #81449, #81450, #81451) are ancestors of the publish commit 989764d42ff, so none of that code is in the published tarballs. This moves the entries back under ## Unreleased.

No version or lockfile changes. After this, the released sections of all 125 package changelogs are byte-identical to what was published.

See #81506

[github-actions]

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Co-authored-by: sirreal <jonsurrell@git.wordpress.org>
Co-authored-by: ntsekouras <ntsekouras@git.wordpress.org>

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[ntsekouras]

I verified with npm changelogs and looks good, thanks for handling this!

[github-actions]

Flaky tests detected in 64c0347.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/31597852239
📝 Reported tests:

does not dirty related template parts or navigation menus when rendered in the post editor in /test/e2e/specs/editor/blocks/navigation-passive-rendering.spec.js, passed after 1 failed attempt.

Error: apiRequestContext.fetch: socket hang up
Call log:
  - → GET http://localhost:8889/wp-json/wp/v2/pages?per_page=100&status=publish%2Cfuture%2Cdraft%2Cpending%2Cprivate%2Ctrash
    - user-agent: Playwright/1.62.1 (x64; ubuntu 24.04) node/20.20 CI/1
    - accept: */*
    - accept-encoding: gzip,deflate,br
    - X-WP-Nonce: 65f91414fd
    - cookie: wordpress_test_cookie=WP%20Cookie%20check; wordpress_logged_in_23778236db82f19306f247e20a353a99=admin%7C1786711745%7CCH4JZzA91JBovaY9xuFr3pZu1BZeNmK39ZWQQcolbkY%7C34c0914e7af4a5e278b8cf16c334f9f1b3ff95803ed26a92b3598a9ea11c6224; wp-settings-time-1=1786539034

    at RequestUtils.rest (/home/runner/work/gutenberg/gutenberg/packages/e2e-test-utils-playwright/src/request-utils/rest.ts:112:39)
    at RequestUtils.deleteAllPages (/home/runner/work/gutenberg/gutenberg/packages/e2e-test-utils-playwright/src/request-utils/pages.ts:44:27)
    at /home/runner/work/gutenberg/gutenberg/test/e2e/specs/editor/blocks/navigation-passive-rendering.spec.js:46:17