Update samples to use repo analysis options, Fix sample templates and a ton of analyzer issues (#77868)

Text editing shortcuts involving the arrow keys are no longer handled by RenderEditable's RawKeyboardListener, they use the new Shortcuts setup.  First PR in a plan to port all text editing keyboard handling to shortcuts.

The TextInput.setMarkedRect message was originally added to support
positioning the IME candidates menu on iOS, but is now used by iOS,
Windows, macOS, and Linux desktop embedders.

Now that ShaderMask works on web, enable it for CupertinoContextMenu and unskip relevant tests.

8feb2e780 [tool] Improve check version ci so that it enforces the version in CHANGELOG and pubspec matches. (flutter/plugins#3678) (#77854)

* Adds set text semantics action to render editable

* addressing comments

* re-enable test

* fix test

* fix more test

* fix bad merge

* addressing comment

* update dynamic to Object?

735e1a520 [image_picker] Implemented 2860 and added Unit Test to test functionality (flutter/plugins#3685) (#77827)