Remove targets goal in favor of target-types goal (#10145)

`target-types` is a better name and has more descriptive information thanks to the Target API.

[ci skip-rust-tests]
[ci skip-jvm-tests]

src/python/pants/core_tasks/register.py

@@ -17,7 +17,6 @@
     RunTestPrepCommand,
 )
 from pants.core_tasks.substitute_aliased_targets import SubstituteAliasedTargets
-from pants.core_tasks.targets_help import TargetsHelp
 from pants.goal.goal import Goal
 from pants.goal.task_registrar import TaskRegistrar as task
 
@@ -59,7 +58,6 @@ def register_goals():
 
     # Getting help.
     task(name="options", action=ExplainOptionsTask).install()
-    task(name="targets", action=TargetsHelp).install()
 
     # Stub for other goals to schedule 'compile'. See noop_exec_task.py for why this is useful.
     task(name="compile", action=NoopCompile).install("compile")

src/python/pants/help/BUILD

@@ -3,16 +3,17 @@
 
 python_library(
   dependencies=[
+    '3rdparty/python:ansicolors',
     '3rdparty/python:dataclasses',
     '3rdparty/python:typing-extensions',
     'src/python/pants/base:build_environment',
-    'src/python/pants/base:exceptions',
-    'src/python/pants/build_graph',
+    'src/python/pants/base:deprecated',
+    'src/python/pants/engine:goal',
     'src/python/pants/engine:unions',
     'src/python/pants/goal',
     'src/python/pants/option:global_options',
+    'src/python/pants/option',
     'src/python/pants/subsystem',
-    'src/python/pants/util:memo',
   ],
   tags = {"partially_type_checked"},
 )
@@ -21,10 +22,10 @@ python_tests(
   name='tests',
   sources=['*_test.py', '!*_integration_test.py'],
   dependencies=[
-    'src/python/pants/engine/internals:native',
-    'src/python/pants/build_graph',
-    'src/python/pants/help',
+    ':help',
+    '3rdparty/python:dataclasses',
     'src/python/pants/option',
+    'src/python/pants/option:global_options',
     'src/python/pants/subsystem',
     'src/python/pants/task',
   ],