Add markdown to notebook entries (#7084)

* try marked out

* fix url validation

* now rendering blockquotes properly

* add abbrv, link titles, and strikethrough

* fix tests and lint

* Closes #6060
- CSS resets and styling for markdown-related HTML markup in Notebook entries.
- Better styling and cursor affordances for Notebook entry selection and editing interaction flow.

* add line breaks option

* Closes #6060
- Tab

* Closes #6060
- Conversion of contenteditable-div to textarea started.
- Stubbed in textarea with styles.

* have it markdown with a textarea and adjust size automatically

* Closes #6060
- Padding added back to text `div` area.

* Closes #6060
- Styles added to support Shift Log and hover behavior for entries on locked pages.
- Removed `--major` styling from Shift Log Commit Entries button
to reduce confusion with entry commit button.
- CSS code cleanups.

* two step focus/edit. also scroll into view for editing

* add markdown, strip all tags, and truncate

* lint

* remove unneeded code

* fix notebook entry, selected page may also be null

* fix existing notebook tests

* lint

* fix whitelist

* readd whitelist

* lint

* fix link tests

* fix tests

* fix tagging test

* add some markdown test

* get rid of pause

* add another sanitization step

---------

Co-authored-by: Charles Hacskaylo <charlesh88@gmail.com>
Co-authored-by: Jesse Mazzella <ozyx@users.noreply.github.com>

e2e/tests/functional/plugins/notebook/notebookSnapshots.e2e.spec.js

@@ -192,8 +192,6 @@ test.describe('Snapshot image tests', () => {
     // be sure that entry was created
     await expect(page.getByText('favicon-96x96.png')).toBeVisible();
 
-    // click on image (need to click twice to focus)
-    await page.getByRole('img', { name: 'favicon-96x96.png thumbnail' }).click();
     await page.getByRole('img', { name: 'favicon-96x96.png thumbnail' }).click();
 
     // expect large image to be displayed