[benchmarks] Disable monitoring on some of our larger microbenchmarks for now (#37905)

These look too large for the configured timeouts internally... will revisit later once the system is starting to be more ready.

Closes #37905

COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/37905 from ctiller:lol-nope 6d44e515b3
PiperOrigin-RevId: 685223450

test/cpp/microbenchmarks/BUILD

@@ -67,7 +67,6 @@ grpc_cc_benchmark(
         "absl/log:check",
         "absl/debugging:leak_check",
     ],
-    monitoring = True,
     deps = [
         ":helpers",
         "//src/core:common_event_engine_closures",
@@ -146,7 +145,6 @@ grpc_cc_benchmark(
 grpc_cc_benchmark(
     name = "bm_huffman_decode",
     srcs = ["bm_huffman_decode.cc"],
-    monitoring = True,
     tags = [
         "nomsan",
         "notsan",
@@ -168,7 +166,6 @@ grpc_cc_benchmark(
 grpc_cc_benchmark(
     name = "bm_arena",
     srcs = ["bm_arena.cc"],
-    monitoring = True,
     tags = [
         "notsan",
     ],
@@ -182,7 +179,6 @@ grpc_cc_benchmark(
     external_deps = [
         "absl/log:check",
     ],
-    monitoring = True,
     tags = [
         "no_mac",
         "no_windows",
@@ -246,7 +242,6 @@ grpc_cc_benchmark(
         "bm_fullstack_streaming_ping_pong.cc",
     ],
     flaky = True,
-    monitoring = True,
     deps = [":fullstack_streaming_ping_pong_h"],
 )
 
@@ -288,7 +283,6 @@ grpc_cc_benchmark(
     srcs = [
         "bm_fullstack_unary_ping_pong.cc",
     ],
-    monitoring = True,
     deps = [":fullstack_unary_ping_pong_h"],
 )
 
@@ -297,7 +291,6 @@ grpc_cc_benchmark(
     srcs = [
         "bm_fullstack_unary_ping_pong_chaotic_good.cc",
     ],
-    monitoring = True,
     deps = [
         ":fullstack_unary_ping_pong_h",
         "//:grpcpp_chaotic_good",
@@ -310,7 +303,6 @@ grpc_cc_benchmark(
     external_deps = [
         "absl/log:check",
     ],
-    monitoring = True,
     uses_event_engine = False,
     deps = [
         ":helpers",
@@ -389,7 +381,6 @@ grpc_cc_benchmark(
     srcs = [
         "bm_callback_streaming_ping_pong.cc",
     ],
-    monitoring = True,
     deps = [":callback_streaming_ping_pong_h"],
 )
 
@@ -400,7 +391,6 @@ grpc_cc_benchmark(
     external_deps = [
         "absl/log:check",
     ],
-    monitoring = True,
     tags = [
         "manual",
         "notap",