Skip check precompiled assets locally

What does this MR do?

Skip check precompiled assets locally

It is rare we add a new precompiled asset nowadays. For each asset, sprockets currently checks every asset path directory (we have about 9K) which is very slow. So disable this check locally.

Speeds up integrations tests locally by about 30%

See !61297 (comment 570514966) for detailed investigation

Before

10 runs of bundle exec spring rspec spec/requests/search_controller_spec.rb:

real	0m42.608s
real	0m39.568s
real	0m40.408s
real	0m42.415s
real	0m37.789s
real	0m35.908s
real	0m36.557s
real	0m37.171s
real	0m37.561s
real	0m37.301s

After

10 runs of bundle exec spring rspec spec/requests/search_controller_spec.rb:

real	0m28.530s
real	0m26.941s
real	0m27.779s
real	0m28.079s
real	0m28.194s
real	0m26.253s
real	0m26.703s
real	0m26.898s
real	0m26.938s
real	0m28.407s