Add automated test for "Apply Bold Styling In Wiki Mode"

The manual test is here: Apply Bold Styling In Wiki Mode

Existing automated coverage

• WikiEditIT#editWikiFormattingToolbarButtons: in the wiki editor of a nested (WebHome) test page, selects text and clicks the Bold toolbar button, asserting the source is wrapped in *...*; the page is never saved
• WikiEditIT#saveAndFormManipulation: Save & View from the wiki editor works (unrelated content)

Missing automated coverage

• On a nested page (WebHome) and on a terminal page: open the wiki editor, type text, select it and click the Bold toolbar button
• Click "Save & View" and assert the view content contains the selected text inside a <strong> element

Suggested location: xwiki-platform-core/xwiki-platform-flamingo/xwiki-platform-flamingo-skin/xwiki-platform-flamingo-skin-test/xwiki-platform-flamingo-skin-test-docker/src/test/it/org/xwiki/flamingo/test/docker/WikiEditIT.java

Found by comparing the XWiki 18.4.4 manual test runs against the automated tests on master (a0055f10a1a).