Fix style-lint warnings for `app/assets/stylesheets/framework/toggle.scss`

What does this MR do?

1. Fixes the following stylelint warnings (from #27767 (closed)):

  87:5  ⚠  ".toggle-icon" and ".toggle-status-checked (app/assets/stylesheets/framework/toggle.scss -67:5)" have the same properties.   stylelint-gitlab/duplicate-selectors
 113:7  ⚠  ".toggle-status-checked" and ".toggle-status-unchecked (app/assets/stylesheets/framework/toggle.scss -71:5)" have the same   stylelint-gitlab/duplicate-selectors
           properties.
 117:7  ⚠  ".toggle-status-unchecked" and ".toggle-icon (app/assets/stylesheets/framework/toggle.scss -87:5)" have the same             stylelint-gitlab/duplicate-selectors
           properties.

2. Updates toggle to use Pajamas-conforming blue (gl-blue-500)
3. Fixes icon alignment
4. Update icon to use GlIcon component

Follow-up to improve specs: !38544 (merged)

Screenshots

"On" state

Before	After

"Off" state

Before	After

Disabled state

Before	After

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team