command: Respect smart sync override declaratively by default

Introduce a `RESPECT_SMART_SYNC_OVERRIDE` class attribute to the base
`Command` class, defaulting to `True`. This allows subcommands to
automatically respect the smart sync override manifest if it exists.

The override is applied in `CommonValidateOptions` before any
subcommand-specific validation or execution occurs. The `sync` and
`init` commands explicitly opt out.

This ensures all workspace-aware subcommands consistently align with the
active smart sync override manifest. It also fixes a bug in
multi-manifest setups where running a command from a submanifest would
not apply the override to the outer manifest, causing inconsistency when
resolving projects across all manifests.

Bug: 279204331
Change-Id: I9426e90a13a77ce6bd94b4a82efda4d485cbe116
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/585081
Reviewed-by: Mike Frysinger <vapier@google.com>
Tested-by: Gavin Mak <gavinmak@google.com>
Commit-Queue: Gavin Mak <gavinmak@google.com>

subcmds/abandon.py

@@ -94,7 +94,6 @@ It is equivalent to "git branch -D <branchname>".
 
     def Execute(self, opt, args):
         nb = args[0].split()
-        self.TryOverrideManifestWithSmartSync()
         err = collections.defaultdict(list)
         success = collections.defaultdict(list)
         aggregate_errors = []

subcmds/forall.py

@@ -243,8 +243,6 @@ without iterating through the remaining projects.
 
         mirror = self.manifest.IsMirror
 
-        self.TryOverrideManifestWithSmartSync()
-
         if opt.regex:
             projects = self.FindProjects(args, all_manifests=all_trees)
         elif opt.inverse_regex:

subcmds/info.py

@@ -147,8 +147,6 @@ class Info(PagedCommand):
         if not opt.this_manifest_only:
             self.manifest = self.manifest.outer_client
 
-        self.TryOverrideManifestWithSmartSync()
-
         output_format = OutputFormat[opt.format.upper()]
         if output_format == OutputFormat.JSON:
             self._ExecuteJson(opt, args)

subcmds/init.py

@@ -33,6 +33,7 @@ _REPO_ALLOW_SHALLOW = os.environ.get("REPO_ALLOW_SHALLOW")
 
 class Init(InteractiveCommand, MirrorSafeCommand):
     COMMON = True
+    RESPECT_SMART_SYNC_OVERRIDE = False
     MULTI_MANIFEST_SUPPORT = True
     helpSummary = "Initialize a repo client checkout in the current directory"
     helpUsage = """

subcmds/start.py

@@ -104,7 +104,6 @@ revision specified in the manifest.
 
     def Execute(self, opt, args):
         nb = args[0]
-        self.TryOverrideManifestWithSmartSync()
         err_projects = []
         err = []
         projects = []

subcmds/sync.py

@@ -312,6 +312,7 @@ class TeeStringIO(io.StringIO):
 
 class Sync(Command, MirrorSafeCommand):
     COMMON = True
+    RESPECT_SMART_SYNC_OVERRIDE = False
     MULTI_MANIFEST_SUPPORT = True
     helpSummary = "Update working tree to the latest revision"
     helpUsage = """