Removed all codeCoverageIgnore annotations from the code

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

These annotations are artificially bumping the code coverage. Unreached code should be reported in the coverage report, even if we cannot reach 100% coverage for some safeguards IMO.
Thus, some places using them were actually testable (and tested) code.