Revert "[build] Add MB config for deprecation warning bot"

This reverts commit 23cb219f.

Reason for revert: https://crbug.com/v8/7996

Original change's description:
> [build] Add MB config for deprecation warning bot
> 
> TBR=yangguo@chromium.org
> NOTRY=true
> 
> Bug: v8:7963
> Change-Id: I1a91047b2a3c7d128f3b01a0970ce53a63c196d6
> Reviewed-on: https://chromium-review.googlesource.com/1145187
> Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> Commit-Queue: Michael Achenbach <machenbach@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#54585}

TBR=machenbach@chromium.org,yangguo@chromium.org
NOTRY=true

Bug: v8:7996
Change-Id: Ib6a0c972cd9bdf864295f70ebeda50f9f23ca314
Reviewed-on: https://chromium-review.googlesource.com/1156404
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54807}

infra/mb/mb_config.pyl

@@ -73,7 +73,6 @@
       'V8 Linux64 - debug builder': 'debug_x64',
       'V8 Linux64 - custom snapshot - debug builder': 'debug_x64_custom',
       'V8 Linux64 - internal snapshot': 'release_x64_internal',
-      'V8 Linux64 - debug - deprecation warnings': 'debug_x64_deprecation_warnings',
       'V8 Linux64 - debug - header includes': 'debug_x64_header_includes',
       'V8 Linux64 - verify csa': 'release_x64_verify_csa',
       # Jumbo.
@@ -505,14 +504,12 @@
       'x64', 'asan', 'edge'],
     'debug_x64_custom': [
       'debug_bot', 'x64', 'v8_snapshot_custom'],
-    'debug_x64_deprecation_warnings': [
-      'debug_bot', 'x64', 'v8_imminent_deprecation_warnings'],
-    'debug_x64_header_includes': [
-      'debug_bot', 'x64', 'v8_check_header_includes'],
     'debug_x64_fuchsia': [
       'debug_bot', 'x64', 'fuchsia'],
     'debug_x64_gcc': [
       'debug_bot', 'x64', 'gcc'],
+    'debug_x64_header_includes': [
+      'debug_bot', 'x64', 'v8_check_header_includes'],
     'debug_x64_jumbo': [
       'debug_bot', 'x64', 'jumbo'],
     'debug_x64_jumbo_limited': [
@@ -807,8 +804,8 @@
       'gn_args': 'is_ubsan_vptr=true is_ubsan_no_recover=false',
     },
 
-    'v8_no_i18n': {
-      'gn_args': 'v8_enable_i18n_support=false icu_use_data_file=false',
+    'v8_check_header_includes': {
+      'gn_args': 'v8_check_header_includes=true',
     },
 
     'v8_enable_concurrent_marking': {
@@ -840,14 +837,6 @@
       'gn_args': 'v8_optimized_debug=false',
     },
 
-    'v8_imminent_deprecation_warnings': {
-      'gn_args': 'v8_imminent_deprecation_warnings=true',
-    },
-
-    'v8_check_header_includes': {
-      'gn_args': 'v8_check_header_includes=true',
-    },
-
     'v8_interpreted_regexp': {
       'gn_args': 'v8_interpreted_regexp=true',
     },
@@ -856,6 +845,10 @@
       # This is the default in gn for debug.
     },
 
+    'v8_no_i18n': {
+      'gn_args': 'v8_enable_i18n_support=false icu_use_data_file=false',
+    },
+
     'v8_snapshot_custom': {
       # GN path is relative to project root.
       'gn_args': 'v8_embed_script="test/mjsunit/mjsunit.js"',