evolve: remove revset calls in warnobserror revset have serious performance impact in several case. The resulting code is a bit too complicated to my taste. I hope for much simpler implementation in core anyway.

syntax: re
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^docs/build/
^docs/html/
^html/
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^tests/easy_run.sh$
^build/
^MANIFEST$
^docs/tutorials/.*\.rst$
\.ico$