chore!: Remove deprecated old event classes with replacements

[luanpotter]

Description

Remove deprecated old event classes, all with replacements already in place.

Checklist

• I have followed the Contributor Guide when preparing my PR.
• I have updated/added tests for ALL new/updated/fixed functionality.
• I have updated/added relevant documentation in docs and added dartdoc comments with ///.
• I have updated/added relevant examples in examples or docs.

Breaking Change?

• Yes, this PR is a breaking change.
• No, this PR is not a breaking change.

[Copilot]

Pull request overview

Removes deprecated game-level tap/long-press detector APIs (and their legacy event info classes) now that replacement callback-based APIs are available, and updates tests/docs to align with the breaking change.

Changes:

• Removed deprecated *TapDetector, DoubleTapDetector, and LongPressDetector mixins plus legacy LongPress*Info event wrappers.
• Removed GameWidget gesture-recognizer wiring and tests that only existed to support those deprecated detectors.
• Added migration guidance and updated detector tests to use callback replacements (e.g. DoubleTapCallbacks).

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
packages/flame/test/gestures/detectors_test.dart	Drops deprecated detector coverage and updates remaining detector tests to use callback replacements where applicable.
packages/flame/test/game/game_widget/game_widget_tap_test.dart	Removes tests that exclusively exercised deprecated tap/double-tap detector mixins.
packages/flame/lib/src/gestures/events.dart	Removes legacy LongPress*Info event wrapper classes that were only used by the deprecated detectors.
packages/flame/lib/src/gestures/detectors.dart	Removes deprecated tap/double-tap/long-press detector mixins.
packages/flame/lib/src/game/game_widget/gesture_detector_builder.dart	Removes gesture recognizer registration code paths that existed solely for deprecated detectors.
packages/flame/lib/src/game/flame_game.dart	Updates hit-testing logic/comments to reflect removal of deprecated game-level detector mixins.
packages/flame/lib/events.dart	Stops exporting removed deprecated detectors and legacy long-press info wrappers.
doc/flame/migration.md	Documents the breaking removal and maps removed APIs to their replacements.
doc/flame/inputs/gesture_input.md	Removes the deprecated tap/long-press detectors from the listed detector taxonomy.

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[Copilot]

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated no new comments.

Suppressed comments (1)

packages/flame/lib/src/game/flame_game.dart:251

• FlameGame.containsEventHandlerAt is used for hit-testing when GameWidget is not HitTestBehavior.opaque (see GameRenderBox.hitTestSelf). After removing the deprecated game-level tap/long-press detectors, the replacement mixins LongPressCallbacks and TertiaryTapCallbacks still aren't recognized in the component scan below, so the widget can fail hit-testing and stop receiving pointer events even when those callbacks are present at the tapped point (or on the game itself).

  bool containsEventHandlerAt(Vector2 position) {
    // Game-level detector mixins handle events for the entire game surface,
    // so any in-bounds point is a hit.
    if (this is VerticalDragDetector ||
        this is HorizontalDragDetector ||

[spydon]

Lgtm!