[build] Make auto-deps the default (#30297)

* [build] Make auto-deps the default

* Automated change: Fix sanity tests

* update

Co-authored-by: ctiller <ctiller@users.noreply.github.com>

tools/distrib/fix_build_deps.py

@@ -261,7 +261,7 @@ def grpc_cc_library(name,
     global num_cc_libraries
     global num_opted_out_cc_libraries
     num_cc_libraries += 1
-    if select_deps or 'nofixdeps' in tags or 'grpc-autodeps' not in tags:
+    if select_deps or 'nofixdeps' in tags:
         if args.whats_left and not select_deps and 'nofixdeps' not in tags:
             num_opted_out_cc_libraries += 1
             print("Not opted in: {}".format(name))
@@ -494,7 +494,8 @@ def make_library(library):
             # assume a system include
             continue
 
-        print("# ERROR: can't categorize header: %s" % hdr)
+        print("# ERROR: can't categorize header: %s used by %s" %
+              (hdr, library))
         error = True
 
     if library in needs_codegen_base_src: