[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.

wpilibjExamples/example_projects.bzl

@@ -1,45 +1,27 @@
-EXAMPLES_FOLDERS = [
-    "addressableled",
-    "apriltagsvision",
-    "arcadedrive",
+EXAMPLE_FOLDERS = [
     "arcadedrivegamepad",
     "armsimulation",
-    "canpdp",
     "differentialdrivebot",
     "differentialdriveposeestimator",
-    "digitalcommunication",
     "drivedistanceoffboard",
     "dutycycleencoder",
-    "dutycycleinput",
     "elevatorexponentialprofile",
     "elevatorexponentialsimulation",
     "elevatorprofiledpid",
     "elevatorsimulation",
     "elevatortrapezoidprofile",
     "encoder",
-    "eventloop",
-    "flywheelbangbangcontroller",
     "gettingstarted",
     "gyro",
-    "gyromecanum",
     "hatchbotinlined",
     "hatchbottraditional",
-    "hidrumble",
-    "httpcamera",
-    "i2ccommunication",
-    "intermediatevision",
     "mecanumbot",
     "mecanumdrive",
     "mecanumdriveposeestimator",
     "mechanism2d",
-    "motorcontrol",
-    "potentiometerpid",
-    "quickvision",
     "rapidreactcommandbot",
     "romireference",
-    "selectcommand",
     "simpledifferentialdrivesimulation",
-    "solenoid",
     "statespacearm",
     "statespaceelevator",
     "statespaceflywheel",
@@ -47,7 +29,6 @@ EXAMPLES_FOLDERS = [
     "swervebot",
     "swervedriveposeestimator",
     "sysidroutine",
-    "tankdrive",
     "tankdrivegamepad",
     "unittest",
     "xrpreference",
@@ -65,25 +46,39 @@ COMMANDS_V2_FOLDERS = [
     "subsystem2",
 ]
 
-SNIPPETS_FOLDERS = [
+SNIPPET_FOLDERS = [
     "accelerometercollision",
     "accelerometerfilter",
+    "addressableled",
     "adxlaccelerometers",
     "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",
     "educational",
@@ -101,11 +96,13 @@ TEMPLATES_FOLDERS = [
     "xrptimed",
 ]
 
-TEST_FOLDERS = [
+EXAMPLE_TESTS_FOLDERS = [
     "armsimulation",
-    "digitalcommunication",
     "elevatorsimulation",
-    "i2ccommunication",
-    "potentiometerpid",
     "unittest",
 ]
+
+SNIPPET_TESTS_FOLDERS = [
+    "digitalcommunication",
+    "i2ccommunication",
+]