[Sheriff] Disable flaky ManifestV3BrowserTest.ActionAPI

TBR=rdevlin.cronin

Bug: 1042671
Change-Id: I62171a6eee538597b5ea9a61e3a62c003ae0b79f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2002914Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732379}

chrome/browser/extensions/manifest_v3_browsertest.cc

@@ -101,7 +101,9 @@ IN_PROC_BROWSER_TEST_F(ManifestV3BrowserTest, ProgrammaticScriptInjection) {
 
 // A simple end-to-end test exercising the new action API in Manifest V3.
 // More robust tests for the action API are in extension_action_apitest.cc.
-IN_PROC_BROWSER_TEST_F(ManifestV3BrowserTest, ActionAPI) {
+//
+// Test is flaky: https://crbug.com/1042671
+IN_PROC_BROWSER_TEST_F(ManifestV3BrowserTest, DISABLED_ActionAPI) {
   constexpr char kManifest[] =
       R"({
            "name": "Action API",