Disable RSpec option filter focus and run_all_when_everything_filtered on CI [RUN ALL RSPEC]

What does this MR do?

Disable RSpec run_all_when_everything_filtered and filter_run focus: true when on CI.

With the run_all_when_everything_filtered configuration set to true (before this MR), it runs all tests when nothing matches the tag:

$ bundle exec rspec spec/lib/gitlab/ci/pipeline/expression/lexeme/and_spec.rb --tag foo
Run options: include {:focus=>true, :foo=>true}

All examples were filtered out; ignoring {:focus=>true, :foo=>true}
..........................

Finished in 0.02526 seconds (files took 3.76 seconds to load)
26 examples, 0 failures

With the configuration set to false, it does not run any tests when nothing matches the tag:

$ bundle exec rspec spec/lib/gitlab/ci/pipeline/expression/lexeme/and_spec.rb --tag foo
Run options: include {:focus=>true, :foo=>true}

All examples were filtered out


Finished in 0.00024 seconds (files took 3.73 seconds to load)
0 examples, 0 failures

Removing run_all_when_everything_filtered also requires filter_run focus: true to be removed. Otherwise, it will not run anything.

Fixes #294212 (closed)