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 c75edc26.

This reverts commit 3ab799bb.

Revert "Let InkWell/Ink/ancestor support GlobalKey so that splash does not stop when changing position. (#71138)" (#79300)

This reverts commit e7266dbb.

Let InkWell/Ink/ancestor support GlobalKey so that splash does not stop when changing position. (#71138)

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

The FocusManager constructor was registering global event handlers
on the shared RawKeyboard instance and the global pointer router.
This posed a few problems: (1) there was no way to unregister these
handlers, and (2) instantiating a second FocusManager would overwrite
the existing focus manager's RawKeyboard handler. This was manifesting
in unexpected ways, such as the fact that constructing a second
BuildOwner (for a parallel tree, for instance) was obliterating the
event handler for the main BuildOwner's focus manager, thus messing
with focus.

This change separates those global event registrations into a
dedicated method, registerGlobalHandlers(), and overrides dispose()
to properly unregister those handlers.

This can be useful for offscreen widget trees, where the caller
wants to completely tear down the tree (properly clean up) when
they're done with the tree, to ensure they're not leaving behind
any event listeners that could be registered by child elements
(which could lead to memory leaks and unexpected behavior).

This reverts commit fe003535.

This gets away from the extra static map for global key registrations
in favor of the data structures being instance properties of the build
owner. This still allows for semantically-equivalent static access through
the binding (which in turn gives access to the build owner).

This also adds a `BuildOwner.globalKeyCount` getter to get the count
of global keys associated with widgets currently in the tree.