CI: Remove pre command hook to ignore restore gradle dependency cache

With this hook present, every build and its within jobs are all
restoring the dependency cache, even when this is not really needed, and
as such, potentially, unnecessarily delaying some jobs, while also
consuming unnecessary resources (downloading from s3, (un)compressing,
etc).

FYI: It is better to use 'restore_gradle_dependency_cache' only on those
jobs that could really benefit from it.

PS: Also, based on the current state of things, with the dependency
cache save/restore mechanism being stale, this
'restore_gradle_dependency_cache' command is not working as expected.
No cache entry is found for 'GRADLE_DEPENDENCY_CACHE' is being output on
every build/job that runs on an 'android' agent, plus an this
'GRADLE_RO_DEP_CACHE: unbound variable' is being output on every
build/job that runs on another agent (like the 'linter' agent).

Author: ParaskP7