Replace Dependency List custom sorting with GlSorting component

What does this MR do?

Replace custom sorting with GlSorting component

A snapshot test was removed, since it provided almost no value.

Using GlSorting has changed the styling slightly, although not in a harmful way: the width of the dropdown is fixed, instead of scaling with the amount of text in the selected item.

The GlSorting component may not be fully Pajamas-compliant, and fixing that may bring this UI back to nearly how it looked previously. This is being addressed in gitlab-ui!2316 (merged).

Addresses part of #335066 (closed).

Draft status

Depends on !66672 (merged).

Screenshots or Screencasts (strongly suggested)

	Before	After
Medium+ device
Small device

Does this MR meet the acceptance criteria?

Conformity

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• [-] 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.