Arvados

The "More options" IconButton seems to have been eliminated because a global click handler was put in place to capture and process all the file browser's clicks on a single function. The file's checkboxes are special-cased, so I'll try to do the same on every "More options" button.

Updates at arvados-workbench2|5550460 - branch 19007-file-browser-action-button
Test run: developer-tests-workbench2: #747

• Brings back the 3-dotted "More options" menu on the file browser.
• Cleans up old file browser code.
• Adds assertions to the Cypress for the new UI element.

I haven't even had a chance to build/test yet, but to show that I'm paying attention, here is a missing semicolon in cypress/integration/collection.spec.js (prevailing style seems to be including the usually-optional semicolon, which makes sense)

                         cy.get('[data-cy=file-item-options-btn')
                             .first()
-                            .click()
+                            .click();
                         cy.get('[data-cy=context-menu]')

Managed to start dev instance, restored menu works. LGTM!