[ZEPPELIN-6358] Fix notebook UI bugs and add aria attributes and test IDs for selectors #5101

### What is this PR for?
This PR fixes several notebook-related UI issues and improves testability and accessibility.

### Changes
- Fix an issue where the search menu trigger did not work correctly.
- Prevent folder renaming when the input is empty by disabling the confirm button.
- Add accessibility (ARIA) attributes and test-specific attributes to improve usability and E2E test stability.

### What type of PR is it?
Bug Fix
Refactoring

### Todos

### What is the Jira issue?
ZEPPELIN-6358

### How should this be tested?

### Screenshots (if appropriate)

### Questions:
* Does the license files need to update? No
* Is there breaking changes for older versions? No
* Does this needs documentation? No 


Closes #5133 from dididy/e2e/notebook-bug.

Signed-off-by: ChanHo Lee <chanholee@apache.org>