[latent_see] Move latent_see to be behind a build define, not a config (#37897)

This will allow latent_see to be used with different build configurations in the future (and eventually perhaps defaulted on for some CI runs to aid postmortem debugging of test failures)

Closes #37897

COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/37897 from ctiller:latent-peek 52cbf36ce5
PiperOrigin-RevId: 684981143

src/core/BUILD

@@ -29,6 +29,11 @@ package(
     ],
 )
 
+config_setting(
+    name = "enable_latent_see",
+    values = {"define": "GRPC_ENABLE_LATENT_SEE=1"},
+)
+
 # This is needed as a transitionary mechanism to build the src/core targets in
 # the top-level BUILD file that have not yet been moved here. Should go away
 # once the transition is complete.
@@ -141,6 +146,10 @@ grpc_cc_library(
     hdrs = [
         "util/latent_see.h",
     ],
+    defines = select({
+        ":enable_latent_see": ["GRPC_ENABLE_LATENT_SEE"],
+        "//conditions:default": [],
+    }),
     external_deps = [
         "absl/base:core_headers",
         "absl/functional:any_invocable",

tools/bazel.rc

@@ -35,8 +35,6 @@ build --define=use_fast_cpp_protos=true
 build:opt --compilation_mode=opt
 build:opt --copt=-Wframe-larger-than=16384
 
-build:latent_see --copt=-DGRPC_ENABLE_LATENT_SEE
-
 build:dbg --compilation_mode=dbg
 
 # Dynamic link cause issues like: `dyld: malformed mach-o: load commands size (59272) > 32768`