Fix Single Address Exclude (#6366)

### Problem

The git commit hook (and CI lint) will lint targets that own changed files. Transforming specs to single addresses is currently broken and causes a "did you mean error" to be thrown on specs that actually exist in an affected build file:

```
ResolveError: "main_py2" was not found in namespace "testprojects/src/python/interpreter_selection/python_3_selection_testing". Did you mean one of:
          :lib_py2
          :lib_py23
          :lib_py3
          :main_py2
          :main_py23
          :main_py3
          :test_py2
          :test_py23
```
This manifested after trying to make changes to a `testprojects` BUILD file, which is excluded in the CI/commit hook lint step:
`./pants -q --exclude-target-regexp='testprojects/.*' --changed-parent=master lint`

### Solution

Edit build_files.py to aggregate excluded addresses in addition to included ones and check that excluded addresses align with exclude logic so that the "did you mean" error only occurs when the spec actually doesn't exist.

### Result

Changes to files in testprojects will not throw any "did you mean" errors in CI/commit hook lint invoked by the following command:
`./pants -q --exclude-target-regexp='testprojects/.*' --changed-parent=master lint`

src/python/pants/engine/build_files.py

@@ -235,13 +235,17 @@ def filter_for_tag(tag):
   include_target = wrap_filters(create_filters(specs.tags if specs.tags else '', filter_for_tag))
 
   addresses = []
+  addresses_to_exclude = []
   included = set()
   def include(address_families, predicate=None):
     matched = False
     for af in address_families:
       for (a, t) in af.addressables.items():
         if (predicate is None or predicate(a)):
-          if include_target(t) and (not exclude_address(a.spec)):
+          should_exclude_address = exclude_address(a.spec)
+          if should_exclude_address:
+            addresses_to_exclude.append(a)
+          if include_target(t) and (not should_exclude_address):
             matched = True
             if a not in included:
               addresses.append(a)
@@ -270,7 +274,7 @@ def include(address_families, predicate=None):
       # spec.name here is generally the root node specified on commandline. equality here implies
       # a root node i.e. node specified on commandline.
       if not include([address_family], predicate=lambda a: a.target_name == spec.name):
-        if len(addresses) == 0:
+        if len(addresses) == 0 and len(addresses_to_exclude) == 0:
           _raise_did_you_mean(address_family, spec.name)
     elif type(spec) is AscendantAddresses:
       include(

tests/python/pants_test/engine/test_build_files.py

@@ -96,6 +96,24 @@ def test_exclude_pattern(self):
     self.assertEqual(len(targets.dependencies), 1)
     self.assertEqual(targets.dependencies[0].spec, 'root:not_me')
 
+  def test_exclude_pattern_with_single_address(self):
+    """Test that single address targets are filtered based on exclude patterns."""
+    spec = SingleAddress('root', 'not_me')
+    address_mapper = AddressMapper(JsonParser(TestTable()))
+    snapshot = Snapshot(DirectoryDigest('xx', 2),
+                        (Path('root/BUILD', File('root/BUILD')),))
+    address_family = AddressFamily('root',
+      {
+       'not_me': ('root/BUILD', TargetAdaptor()),
+      }
+    )
+    targets = run_rule(
+      addresses_from_address_families, address_mapper, Specs([spec], exclude_patterns=tuple(['root.*'])),{
+      (Snapshot, PathGlobs): lambda _: snapshot,
+      (AddressFamily, Dir): lambda _: address_family,
+    })
+    self.assertEqual(len(targets.dependencies), 0)
+
 
 class ApacheThriftConfiguration(StructWithDeps):
   # An example of a mixed-mode object - can be directly embedded without a name or else referenced