[ZEPPELIN-6298] Fix cursor-related issues in New UI's Paragraph

### What is this PR for?
**Description:**
Cursor behavior in the New UI’s paragraph needs to be fixed for several cursor related actions, including double-clicking, running all above/below, adding(clone), and removing paragraphs.

When **cloneParagraph()** is called, it internally calls **addParagraph()**, which has already been tested. The same addParagraph-related code is also applied in #5044. If either PR is merged first, I will rebase accordingly. I have also confirmed that **cloneParagraph()** works correctly through #5044.

Due to timing issues, I used `setTimeout` for **removeParagraph()** and **doubleClickParagraph()**. Since this is in the UI area, it likely won’t have major side effects, but I will look into it further.

**Expected:**
- When **doubleClickParagraph()** is executed, the cursor should move to the end of the paragraph.
- When **runAllAbove()** or **runAllBelow()** is executed, the current cursor position should be remembered, and after execution, focus should return to the previous cursor position.
- When **addParagraph()** is executed, the newly added paragraph should receive focus.
- When **removeParagraph()** is executed, focus should move to the paragraph that takes the deleted paragraph’s place.

**Actual (New UI):**
- When **doubleClickParagraph()** is executed, the cursor moves to the beginning instead of the end.
- After **runAllAbove()** or **runAllBelow()**, focus is lost completely.
- When **addParagraph()** is executed, the new paragraph does not automatically receive focus.
- After **removeParagraph()**, focus may not move to the correct paragraph.

**[Appropriate action - Classic UI]**

https://github.com/user-attachments/assets/fc0066f7-4e03-4e3b-9d5b-2f33df415ba7

Run all above -> Run all below -> Double click .md paragraph  -> Add paragraph -> Delete paragraph

**[AS-IS]**

https://github.com/user-attachments/assets/f699f788-cf29-4c4c-8c47-2ef34d7962f0

Run all above -> Run all below -> Double click .md paragraph  -> Add paragraph -> Delete paragraph

**[TO-BE]**

https://github.com/user-attachments/assets/1206c524-103f-4328-85ee-04408073b628

Run all above -> Run all below -> Double click .md paragraph  -> Add paragraph -> Delete paragraph


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

### Todos

### What is the Jira issue?
* [[ZEPPELIN-6298](https://issues.apache.org/jira/browse/ZEPPELIN-6298)]

### How should this be tested?

### Screenshots (if appropriate)

### Questions:
* Does the license files need to update? N
* Is there breaking changes for older versions? N
* Does this needs documentation? N


Closes #5057 from dididy/fix/ZEPPELIN-6298.

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