[flutter_tool][gallery] Standardize target platform override behavior in tool and update flutter gallery to support it (#46206)

This reverts commit 2a113165.

* Update project.pbxproj files to say Flutter rather than Chromium

Also, the templates now have an empty organization so that we don't cause people to give their apps a Flutter copyright.

* Update the copyright notice checker to require a standard notice on all files

* Update copyrights on Dart files. (This was a mechanical commit.)

* Fix weird license headers on Dart files that deviate from our conventions; relicense Shrine.

Some were already marked "The Flutter Authors", not clear why. Their
dates have been normalized. Some were missing the blank line after the
license. Some were randomly different in trivial ways for no apparent
reason (e.g. missing the trailing period).

* Clean up the copyrights in non-Dart files. (Manual edits.)

Also, make sure templates don't have copyrights.

* Fix some more ORGANIZATIONNAMEs

This reverts commit 2135e9fb.

This reverts commit 6d77996d.

Fixes various Flutter framework test failures when bytecode is enabled.

Applying our style guide:
https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo#have-good-hygiene-when-using-temporary-directories

Bytecode generation will otherwise omit assert code, causing --enable-asserts to have no effect in the VM.

This was part of a disused tool to explain what did and did not run after reload.

* add web server device

* remove extra async

* fixes to server device

* testing updates

* fix test cases

* address comments

The use-application-binary flag can be used to run a previously built
app package.