Pass WPT tests for Gamepad and catch up to spec

[msub2]

Once #31200 merges Servo will finally have the ability to use non-XR gamepads. However, there's still work remaining to be fully spec compliant and pass all the existing WPTs. The following tests currently still expect fails:

• gamepad-default-feature-policy
  • Fails due to the "allow" directive not being supported
• gamepad-supported-by-feature-policy
  • Fails because it expects document.featurePolicy to exist. Feature Policy has been succeeded by Permissions Policy however, so what really needs to happen is for the test to be changed/updated.
• idlharness-extensions
  • Fails due to missing implementations for GamepadTouch and GamepadHapticActuator
• idlharness
  • Fails due to missing GamepadHapticActuator implementation as well as these GamepadEvent issues
    • [GamepadEvent must be primary interface of new GamepadEvent("gamepad")]
    • [GamepadEvent interface: new GamepadEvent("gamepad") must inherit property "gamepad" with the proper type]
    • [Stringification of new GamepadEvent("gamepad")]

The following are the tasks necessary to fix these and be fully spec-compliant:

• GamepadHapticActuator implementation (Gamepad: Implement GamepadHapticActuator #32046)
• Gamepad Permissions Policy implementation
• Array.isArray(navigator.getGamepads()) should return true (Gamepad: Align closer to spec and implement missing slots #31385)
  • Currently we are returning a GamepadList instead of just an array of Gamepads
• Gamepad.[[exposed]] and navigator.[[hasGamepadGesture]] (Gamepad: Align closer to spec and implement missing slots #31385)

[msub2]

No longer need to worry about secure context, removing it from the list