…lastic#60840)

* Move timeline template to Define step of Rule creation

This required a refactor/simplification of the step_define_rule logic to
make things work. In retrospect I think that the issue was we were not
handling incoming `defaultValues` props well, which was causing local
component state to be lost.

Now that we're doing a merge and removed a few unneeded local useStates,
things are a) working and b) cleaner

* Fix Rule details/edit view with updated data

We need to fix the other side of the equation to get these to work: the
timeline data was moved to a different step during creation, but when
viewing on the frontend we split the rule data back into the separate
"steps."

* Remove unused import

* Fix bug in formatDefineStepData

I neglected to pass through index in a previous commit.

* Update tests now that timeline has movied to a different step

* Fix more tests

* Update StepRuleDescription snapshots

* Fix cypress Rule Creation test

Timeline template moved, and so tests broke.

* Add unit tests for filterRuleFieldsForType