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feature flag

Signed-off-by: Rémy Coutable <remy@rymai.me>

Updates the parameters that are dispatched when
using the legacy filter bar

The plan for RSpec 4.0 is to disable monkey patching:
https://rspec.info/blog/2013/07/the-plan-for-rspec-3/#zero-monkey-patching-mode

This commit stops using RSpec monkey patching:
https://relishapp.com/rspec/rspec-core/docs/configuration/zero-monkey-patching-mode

- Implement feature flag checks
and render legacy filtered search
when feature flag is disabled

This makes Code Review Analytics generally available

- Adds the search bar to
the code analytics review page