This reverts commit 5fd259be.

This reverts commit cb378edc.

This modifies the flutter update-packages and flutter update-packages --force-upgrade commands so that the many invocations of "dart pub get" in each repo project run in parallel instead of in series.

Disable the automatic "pub get" if the project is using a third-party tool for linking dependencies. (#86177)

To specify the dill file that will be used to initialize the resident
compiler, instead of the default cached version.

Also, refactor internal code to do the same.

See https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo#avoid-double-negatives-in-apis

[flutter_tools] generate empty plugin registrants for winuwp and fix local engine for winuwp_ (#79827)