Prepopulate new issue with link to the parent

What does this MR do?

In the "New issue" link in the dropdown menu at the top of each issue detail view…

…this MR changes the link so that it prepopulates the newly-created issue with a link to the original issue.

See discussion on #198494 (closed).

Screenshots or Screencasts

The modified link:

The resulting New Issue form:

Updated to reflect !68226 (comment 659897084)

How to setup and validate locally

1. View an issue
2. At the top of the issue, click the issue header actions dropdown menu
3. Click "New issue"
4. Notice that the new issue form has a link to the issue you viewed in step 1

I also tested using an Incident and confirmed that this change also preserves the query parameters for Incidents.

Does this MR meet the acceptance criteria?

Conformity

• I have included changelog trailers, or none are needed. (Does this MR need a changelog?)
  • Probably not significant enough for a changelog?
• I have added/updated documentation, or it's not needed. (Is documentation required?)
  • Probably not significant enough for documentation?
• I have properly separated EE content from FOSS, or this MR is FOSS only. (Where should EE code go?)
  • FOSS-only
• I have added information for database reviewers in the MR description, or it's not needed. (Does this MR have database related changes?)
  • No database changes to review
• 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.
  • Not a browser-compatibility risk
• I have informed the Infrastructure department of a default or new setting change per definition of done, or it's not needed.
  • No settings changes

Related to #198494 (closed)