Remove fake image implementations, add createTestImage to flutter_test

This reverts commit adc9dde3.

- Fixed issue where `FallbackDiscovery` would hold on to a `VmService` when launching on iOS devices, causing DDS to fail to start
- Fixed `flutter drive` case where DDS is already running in another flutter_tools instance

Revert "Reland "Add support for Dart Development Service (DDS) in Flutter Tools (#61276)" (#61975)" (#61993)

This reverts commit f7a1c87f.

This reverts commit 4867f593.

Revert "Reland "Add support for Dart Development Service (DDS) in Flutter Tools (#61276)" (#61882)" (#61909)

This reverts commit 895b7ef6.

This reverts commit 38fe8873.

Revert "Reland "Add support for Dart Development Service (DDS) in Flutter Tools (#61276)" (#61633)" (#61641)

This reverts commit 594c3541.

This reverts commit a1a5a8f6.

Revert "Reland "Add support for Dart Development Service (DDS) in Flutter Tools (#61276)" (#61395)" (#61498)

This reverts commit f98184e4.

This reverts commit 5b9c6e2b.

This reverts commit fe7bbf72.

* Reland "Live image cache" (#51441)

This reverts commit 419a2853.

* Make evict safer

* Revert "Live image cache (#51249)"

This reverts commit e2dcdb60.

* fix tests for other commit

* Revert "Revert "Live image cache (#50318)" (#51131)"

This reverts commit 2f09d601.

* Fix eviction of a pending image

This reverts commit 1602be6a.

Track images available on screen