Review new rules from eslint-config-airbnb 19.0.4 marked as warnings

[mfacar]

With the upgrade of eslint-config-airbnb in https://github.com/huridocs/uwazi/pull/4918 we had to set as warnings the rules "no-restricted-exports" and "import/no-import-module-exports" until we can make a decision about how to handle the imports correctly.

Additionally, there were added a couple of TODOs // TODO: remove this, for reported as not used methods that have to be reviewed since there were identified some others that were false positives, they are used in an indirect way.