[rush] Refactor the task runner code to be more naturally adapted to phased builds. #3103
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Summary
This change renames a bunch of files and classes around the task runner to no longer mention the word "build" and refactors the task selector to be more easily adapted to specify multiple tasks per project.
This also replaces the "build" portion of log filenames with a normalized version of the name of the script being run.
Details
This change touches a large number of files, but most of the change is renames and minor refactors. A follow-up PR will introduce phased commands to the task scheduler.
Reference: Design Proposal: "phased" custom commands
How it was tested
Tested by building this repo and a large internal repo.