Refactor for tree processor

[mjesun]

This PR is a revamp of #5885, #6006, and #6100, removing the need of the flag.

cc // @niieani

[mjesun]

Don't merge until @niieani gives green light!

[SimenB]

Should we add tests for the order?

[mjesun]

@SimenB It was added in #6098 😎

[SimenB]

Awesome!

[SimenB]

Needs a snapshot update for a stack change

[niieani]

Looks good, thanks @mjesun. I've run the webpack suite with the legacy order (as is here) and it passed. Hopefully it will work in the long run.
We should still think about the before/after order in the future.

[codecov-io]

Codecov Report

Merging #6177 into master will decrease coverage by 0.06%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #6177      +/-   ##
==========================================
- Coverage   64.22%   64.15%   -0.07%     
==========================================
  Files         219      219              
  Lines        8430     8428       -2     
  Branches        4        4              
==========================================
- Hits         5414     5407       -7     
- Misses       3015     3020       +5     
  Partials        1        1

Impacted Files	Coverage Δ
packages/jest-jasmine2/src/tree_processor.js	0% <0%> (ø)	⬆️
packages/jest-jasmine2/src/jasmine/Env.js	0% <0%> (ø)	⬆️
.../pretty-format/src/plugins/react_test_component.js	100% <0%> (ø)	⬆️
...ackages/pretty-format/src/plugins/react_element.js	100% <0%> (ø)	⬆️

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