Simplify git.py and scm.py (#10251)

We had many unused methods. Many of them are not safe in a v2 world, such as `push()`. Further, unused code increases our tech debt.

[ci skip-rust-tests]

src/python/pants/goal/BUILD

@@ -32,7 +32,6 @@ python_library(
   sources = ['context.py'],
   dependencies = [
     ':products',
-    ':workspace',
     'src/python/pants/base:build_environment',
     'src/python/pants/build_graph',
     'src/python/pants/base:deprecated',
@@ -98,12 +97,3 @@ python_library(
     'src/python/pants/util:memo',
   ],
 )
-
-python_library(
-  name = 'workspace',
-  sources = ['workspace.py'],
-  dependencies = [
-    'src/python/pants/base:build_environment',
-    'src/python/pants/scm',
-  ],
-)

src/python/pants/goal/context.py

@@ -18,7 +18,6 @@
 )
 from pants.goal.products import Products
 from pants.goal.run_tracker import RunTracker
-from pants.goal.workspace import ScmWorkspace
 from pants.option.options import Options
 from pants.process.lock import OwnerPrintingInterProcessFileLock
 from pants.source.source_root import SourceRootConfig
@@ -77,7 +76,7 @@ def __init__(
         self.requested_goals = requested_goals or []
         self._console_outstream = console_outstream or sys.stdout.buffer
         self._scm = scm or get_scm()
-        self._workspace = workspace or (ScmWorkspace(self._scm) if self._scm else None)
+        self._workspace = workspace
         self._replace_targets(target_roots)
         self._invalidation_report = invalidation_report
         self._scheduler = scheduler

src/python/pants/scm/BUILD

@@ -4,8 +4,6 @@
 python_library(
   dependencies = [
     'src/python/pants/util:contextutil',
-    'src/python/pants/util:memo',
-    'src/python/pants/util:strutil',
   ],
 )