This reverts commit 1d9edde0.

This reverts commit 5fd259be.

This reverts commit cb378edc.

Offline pub assumes that the pub cache contains all needed packages.  Running
"flutter create" in online mode first will ensure that the pub cache is populated.

Fixes https://github.com/flutter/flutter/issues/89759

* Use `dart __deprecated_pub` instead of `pub` to invoke pub from tools

The top level `pub` commmand has been deprecated and will print
a message. It is however implemented via the __deprecated_pub command
that prints no message.

This reverts commit 7c24ff2c.

Top level `pub` is being deprecated.

* Randomize tests, exclude tests that fail with randomization.

* Disable some more tool tests

This adds avoid_dynamic_calls to the list of lints, and fixes all instances where it was violated.

Importantly, this lint is NOT turned on for flutter/packages/test, because those changes are happening in another PR: #84478

This reverts commit c835ad43.