Verify the file explorer and logger for when file inputs are used

The following discussion from !206931 (merged) should be addressed:

• @furkanayhan started a discussion: (+3 comments)

  Do we have to send this context all the way down to lib/gitlab/ci/config/interpolation/interpolator.rb?

  Why not create its own context?

  Does it also affect the "included files" tree? Should it?

  

• We also need to check and improve the parameter usage -!206931 (comment 2893287200)