Remove vertical scrollbar on GLQL tables

What does this MR do and why?

Remove vertical scrollbar on GLQL tables

On hover, GLQL tables rendered a vertical scrollbar due to resizable columns feature added recently. Add a gl-overflow-y-hidden to prevent showing a vertical scrollbar.

Changelog: fixed

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Screenshots or screen recordings

Before After
image image

How to set up and validate locally

  1. Enable feature flag :glql_integration
  2. Assign yourself some issues in a project.
  3. Create a new issue with the below GLQL query:
```glql
---
display: table
fields: title, milestone, assignees
---
assignee = currentUser()
```
  1. Save
  2. Hover on the table and scroll.
  3. There should be no vertical scrollbar visible.

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