Promote all_tast_tests out of experimental on the eve-arc-r tester.

It's green now:
https://ci.chromium.org/p/chrome/builders/ci/chromeos-eve-arc-r-chrome/2555

But keep the sanity test experimental.

Bug: 1092973
Change-Id: I18085bf954fd512a1a4d0099a292f864a0ea02c1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2346946
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Garrett Beaty <gbeaty@chromium.org>
Auto-Submit: Ben Pastene <bpastene@chromium.org>
Reviewed-by: Garrett Beaty <gbeaty@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796461}

testing/buildbot/chrome.ci.json

@@ -1384,7 +1384,6 @@
         }
       },
       {
-        "experiment_percentage": 100,
         "merge": {
           "args": [],
           "script": "//testing/merge_scripts/standard_gtest_merge.py"

testing/buildbot/chrome.json

@@ -754,7 +754,6 @@
         }
       },
       {
-        "experiment_percentage": 100,
         "merge": {
           "args": [],
           "script": "//testing/merge_scripts/standard_gtest_merge.py"

testing/buildbot/test_suite_exceptions.pyl

@@ -676,13 +676,6 @@
       'mac-archive-rel',
     ],
   },
-  'chrome_all_tast_tests': {
-    'modifications': {
-      'chromeos-eve-arc-r-chrome': {
-        'experiment_percentage': 100,  # https://crbug.com/1092973
-      },
-    },
-  },
   'chrome_java_test_pagecontroller_tests': {
     'remove_from': [
       'android-pie-arm64-rel',  # https://crbug.com/924194
@@ -1144,7 +1137,7 @@
   'cros_browser_sanity_test': {
     'modifications': {
       'chromeos-eve-arc-r-chrome': {
-        'experiment_percentage': 100,  # https://crbug.com/1092973
+        'experiment_percentage': 100,  # https://crbug.com/1114741
       },
     },
   },