Spike: Unregister runtime artifacts for Controller class

[dhmlau]

Description / Steps to reproduce / Feature proposal

Originated from #2619

Please see @bajtos' comment: #2619 (comment) for details

Acceptance Criteria

• When a controller + repo + model is unregistered, there must be no memory references remaining, so that V8 can release and collect the memory.
• Test case: write a loop creating & unregistering model+repo+controller. The process should use relatively constant memory, the memory usage must not grow.
  • The test should not run it as part of npm test workflow

Timebox to 3 days

[bajtos]

Test case: write a loop creating & unregistering model+repo+controller. The process should use relatively constant memory, the memory usage must not grow.

I am expecting that such test will require at least several seconds (if not minutes) to run. We should not run it as part of npm test workflow.

[stale]

This issue has been marked stale because it has not seen activity within six months. If you believe this to be in error, please contact one of the code owners, listed in the CODEOWNERS file at the top-level of this repository. This issue will be closed within 30 days of being stale.

[stale]

This issue has been marked stale because it has not seen activity within six months. If you believe this to be in error, please contact one of the code owners, listed in the CODEOWNERS file at the top-level of this repository. This issue will be closed within 30 days of being stale.

[stale]

This issue has been closed due to continued inactivity. Thank you for your understanding. If you believe this to be in error, please contact one of the code owners, listed in the CODEOWNERS file at the top-level of this repository.