Resolve "Replace all in_-queries with generic drop in replacement"
Description
This MR replaces all in_-queries (unless rigorously tested) with a generic drop-in replacement to avoid performance issues. Also added tests to the ELLA mypy
plugin to ensure that the generic drop-in replacement is only used whenever explicitly permitted.
Notes to review (code/docs/QA)
Related issues
Closes #2179 (closed)
Edited by Vetle Simensen