Avoid fingerprinting the absolute path to the source file

This change aims to make source files relocatable w.r.t. to the interface files produced by the compiler.
This is so that we can download interface files produced by a cloud build system and then reuse them in a local ghcide session

catch another case of implicit includes

actually use the implicit quote includes

add another missing case

recomp020

test that .hi files are reused even if .hs files are moved to a new location

Added recomp021 to record behaviour with non implicit includes

add a note

additional pointer to the note

Mention  #16956 in Note

(cherry picked from commit 9faafb0a)