[examples] Clean up examples (#8674)

Move various "examples" into snippets. Several examples that were less
than a full mechanism or robot were moved to snippets. `arcadedrive` and
`tankdrive` were removed in favor of their Gamepad variants. `hidrumble`
was removed due to being too simple. `potentiometerpid` was removed
because of low utility. `gyromecanum` replaced `mecanumdrive` for
deduplication and because very few teams run holonomic drivetrains
without gyros.

wpilibcExamples/example_projects.bzl

@@ -1,46 +1,28 @@
 EXAMPLE_FOLDERS = [
-    "AddressableLED",
-    "AprilTagsVision",
-    "ArcadeDrive",
     "ArcadeDriveGamepad",
     "ArmSimulation",
-    "CANPDP",
     "DifferentialDriveBot",
     "DifferentialDrivePoseEstimator",
-    "DigitalCommunication",
     "DriveDistanceOffboard",
     "DutyCycleEncoder",
-    "DutyCycleInput",
     "ElevatorExponentialProfile",
     "ElevatorExponentialSimulation",
     "ElevatorProfiledPID",
     "ElevatorSimulation",
     "ElevatorTrapezoidProfile",
     "Encoder",
-    "EventLoop",
-    "FlywheelBangBangController",
     "GettingStarted",
     "Gyro",
-    "GyroMecanum",
     "HAL",
     "HatchbotInlined",
     "HatchbotTraditional",
-    "HidRumble",
-    "HttpCamera",
-    "I2CCommunication",
-    "IntermediateVision",
     "MecanumBot",
     "MecanumDrive",
     "MecanumDrivePoseEstimator",
     "Mechanism2d",
-    "MotorControl",
-    "PotentiometerPID",
-    "QuickVision",
     "RapidReactCommandBot",
     "RomiReference",
-    "SelectCommand",
     "SimpleDifferentialDriveSimulation",
-    "Solenoid",
     "StateSpaceArm",
     "StateSpaceElevator",
     "StateSpaceFlywheel",
@@ -48,7 +30,6 @@ EXAMPLE_FOLDERS = [
     "SwerveBot",
     "SwerveDrivePoseEstimator",
     "SysIdRoutine",
-    "TankDrive",
     "TankDriveGamepad",
     "UnitTest",
     "XRPReference",
@@ -66,25 +47,39 @@ COMMANDS_V2_FOLDERS = [
     "subsystem2",
 ]
 
-SNIPPETS_FOLDERS = [
+SNIPPET_FOLDERS = [
     "ADXLAccelerometers",
     "AccelerometerCollision",
     "AccelerometerFilter",
+    "AddressableLED",
     "AnalogAccelerometer",
     "AnalogEncoder",
     "AnalogInput",
     "AnalogPotentiometer",
+    "AprilTagsVision",
+    "CANPDP",
+    "DigitalCommunication",
     "DigitalInput",
     "DutyCycleEncoder",
+    "DutyCycleInput",
     "Encoder",
     "EncoderDrive",
     "EncoderHoming",
+    "EventLoop",
+    "FlywheelBangBangController",
+    "HttpCamera",
+    "I2CCommunication",
+    "IntermediateVision",
     "LimitSwitch",
+    "MotorControl",
     "OnboardIMU",
     "ProfiledPIDFeedforward",
+    "QuickVision",
+    "SelectCommand",
+    "Solenoid",
 ]
 
-TEMPLATES_FOLDERS = [
+TEMPLATE_FOLDERS = [
     "commandv2",
     "commandv2skeleton",
     "opmode",
@@ -95,11 +90,13 @@ TEMPLATES_FOLDERS = [
     "timesliceskeleton",
 ]
 
-TESTS_FOLDERS = [
+EXAMPLE_TESTS_FOLDERS = [
     "ArmSimulation",
-    "DigitalCommunication",
     "ElevatorSimulation",
-    "I2CCommunication",
-    "PotentiometerPID",
     "UnitTest",
 ]
+
+SNIPPET_TESTS_FOLDERS = [
+    "DigitalCommunication",
+    "I2CCommunication",
+]