Deleting source project with existing fork link should close all related merge requests

What does this MR do?

Deleting source project with existing fork link should close all related merge requests and shouldn't render invalid template for merge requests with deleted source project. The merge request without source project can be edited but can't be reopened.

Screenshots

Before was rendered invalid template:

After is rendered show with message about missing source project:

Does this MR meet the acceptance criteria?

• [CHANGELOG]
• Tests
  • Added for this feature/bug
  • All builds are passing

What are the relevant issue numbers?

Closes #21636 (closed)

cc @ubudzisz @yorickpeterse @grzesiek @tmaczukin

Added 1 commit:

• 37724423 - Add #closed_without_source_project?

Added 70 commits:

• 37724423...ae1da08f - 66 commits from branch gitlab-org:master
• 5d49c750 - Before deleting project if forked unlink fork
• ce7f909b - Checks if deleting forked project closed all open merge requests
• aa553e6d - Add #closed_without_source_project?
• 0fb823d9 - Add test checking method closed_without_source_project

Milestone changed to %8.12

Added ~164274 label

Reassigned to @kradydal

Added 176 commits:

• 0fb823d9...43d6328f - 170 commits from branch gitlab-org:master
• 63f21512 - Before deleting project if forked unlink fork
• 4dfe04e6 - Checks if deleting forked project closed all open merge requests
• 4c9a57b2 - Add #closed_without_source_project?
• cae6b255 - Add test checking method closed_without_source_project
• e8ba93e7 - Add method
• bf38978f - Add #can_reopen? and tests

Resolved all discussions

@yorickpeterse could you take a look? I added method can_reopen?and unit tests.

Added 2 commits:

• e91ee44e - Improve grammar
• 53ca6d3b - Add CHANGELOG

Marked the task Added for this feature/bug as completed

Added 128 commits:

• 53ca6d3b...796bdf1d - 120 commits from branch gitlab-org:master
• 9321dc3a - Before deleting project if forked unlink fork
• 75fbb927 - Checks if deleting forked project closed all open merge requests
• c023c85a - Add #closed_without_source_project?
• 074172e4 - Add test checking method closed_without_source_project
• 64a2e98c - Add method
• f26c2653 - Add #can_reopen? and tests
• ea7b1d2e - Improve grammar
• 09a5c1b1 - Add CHANGELOG

Resolved all discussions

Unmarked this merge request as a Work In Progress

Marked the task All builds are passing as completed

@yorickpeterse could you take a look in your spare time? What do you think?

Added 54 commits:

• 09a5c1b1...6c8516db - 46 commits from branch gitlab-org:master
• 83afb454 - Before deleting project if forked unlink fork
• dd3d06e3 - Checks if deleting forked project closed all open merge requests
• 86dfeb51 - Add #closed_without_source_project?
• 959d1655 - Add test checking method closed_without_source_project
• 1698fad3 - Add method
• 2ce3031a - Add #can_reopen? and tests
• 6a445a02 - Improve grammar
• c70295f6 - Add CHANGELOG

Added 12 commits:

• c70295f6...45afdbef - 3 commits from branch gitlab-org:master
• 03d9ee73 - Before deleting project if forked unlink fork
• 7573e6ca - Checks if deleting forked project closed all open merge requests
• d9c365a6 - Add #closed_without_source_project?
• e223b2c7 - Add test checking method closed_without_source_project
• 735cacbb - Add method
• f9f0a0ee - Add #can_reopen? and tests
• 082f2f4d - Improve grammar
• 8ce2f355 - Add CHANGELOG
• 350ea8b1 - Fix test

Resolved all discussions

Added 30 commits:

• 8ce2f355...6b88cc64 - 21 commits from branch gitlab-org:master
• 736d9830 - Before deleting project if forked unlink fork
• 0d500b45 - Checks if deleting forked project closed all open merge requests
• 48c6dd2a - Add #closed_without_source_project?
• 37b7223d - Add test checking method closed_without_source_project
• 93ccfeaf - Add method
• 9705c655 - Add #can_reopen? and tests
• d8969416 - Improve grammar
• 568b8443 - Add CHANGELOG
• 6696285f - Fix not working test with execute

Changed title: Resolve "Deleting source project with existing fork link should close all related merge requests" → Deleting source project with existing fork link should close all related merge requests

Resolved all discussions

Reassigned to @rymai

@kradydal Nice work, could you add screenshots of the change (if applicable)? Thanks!

Added 31 commits:

• 6696285f...f7be904a - 21 commits from branch gitlab-org:master
• 890445d0 - Before deleting project if forked unlink fork
• 34a56c1b - Checks if deleting forked project closed all open merge requests
• 83cc67f1 - Add #closed_without_source_project?
• acebc800 - Add test checking method closed_without_source_project
• d1f5b125 - Add method
• 9782f8ac - Add #can_reopen? and tests
• 48a560a4 - Improve grammar
• 8a460d13 - Add CHANGELOG
• 96f63e49 - Fix not working test with execute
• 984bd2b1 - Improve grammar

@rymai Screenshots added, and small grammar mistake fixed

Resolved all discussions

@kradydal Thanks, I had a few more remarks, great work!

Added 20 commits:

• 984bd2b1...a0c46221 - 9 commits from branch gitlab-org:master
• 8c77a1fb - Before deleting project if forked unlink fork
• 09cded29 - Checks if deleting forked project closed all open merge requests
• 31c37c6c - Add #closed_without_source_project?
• 81da7f13 - Add test checking method closed_without_source_project
• 554baec9 - Add method
• 34c146a1 - Add #can_reopen? and tests
• d88f708b - Improve grammar
• 0437842d - Add CHANGELOG
• bef1292c - Fix not working test with execute
• 34586c18 - Improve grammar
• 66e92895 - Change method name to #reopenable?

Resolved all discussions

@rymai I've made changes as you suggested.

Status changed to merged

mentioned in commit 404f438f

Mentioned in issue #22248 (closed)

Mentioned in merge request !6383 (merged)

Mentioned in issue #22255 (closed)

Mentioned in issue #21636 (closed)

Mentioned in commit 1e7ea64e

Mentioned in commit 404f438f

Mentioned in issue #22296 (closed)