cleanup: remove lint backlog

[krystophny]

Verification

Test fails on main

fo lint before this branch:

246 unused import(s), 83 compiler warning(s)

Test passes after fix

fo lint:

no issues found

fo:

Static: OK (636 modules, 335 changed, 335 affected)
Build: OK
Tests: OK
Lint: OK
All stages passed

make verify-artifacts:

Artifact verification passed.

make test-ci:

CI essential test suite completed successfully