Migrate auto rollback checkbox to gitlab_ui_checkbox_component

What does this MR do?

Related to #336699 (closed)

This migrates the GitLab UI checkbox in ee/app/views/projects/settings/ci_cd/_auto_rollback.html.haml to gitlab_ui_checkbox_component.

Steps to test

1. Go to a project
2. Go to Settings > CI/CD
3. Expand the Automatic deployment rollbacks section
4. See the checkbox in the card

Screenshots

Before	After

The change of the bold label is to align with the design spec of the GitLab UI checkbox.

Does this MR meet the acceptance criteria?

Conformity

• I have included changelog trailers, or none are needed. (Does this MR need a changelog?)
• I have added/updated documentation, or it's not needed. (Is documentation required?)
• I have properly separated EE content from FOSS, or this MR is FOSS only. (Where should EE code go?)
• I have added information for database reviewers in the MR description, or it's not needed. (Does this MR have database related changes?)
• I have self-reviewed this MR per code review guidelines.
• This MR does not harm performance, or I have asked a reviewer to help assess the performance impact. (Merge request performance guidelines)
• I have followed the style guides.
• This change is backwards compatible across updates, or this does not apply.

Availability and Testing

• I have added/updated tests following the Testing Guide, or it's not needed. (Consider all test levels. See the Test Planning Process.)
• I have tested this MR in all supported browsers, or it's not needed.
• I have informed the Infrastructure department of a default or new setting change per definition of done, or it's not needed.