[M118][infra] Remove Quick Run additional_mode

Also remove the inactive rts on dry run experiment

(cherry picked from commit 75b7c8c)

Bug: 1469110
Change-Id: Ic2bd40de9be1711c749c97033f3e96fb1dec42fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4879884
Reviewed-by: Garrett Beaty <gbeaty@google.com>
Commit-Queue: Garrett Beaty <gbeaty@google.com>
Auto-Submit: Struan Shrimpton <sshrimp@google.com>
Cr-Original-Commit-Position: refs/heads/main@{#1199250}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5120328
Reviewed-by: Struan Shrimpton <sshrimp@google.com>
Cr-Commit-Position: refs/branch-heads/5993@{#1681}
Cr-Branched-From: 5113507-refs/heads/main@{#1192594}

infra/config/generated/luci/commit-queue.cfg

@@ -985,16 +985,4 @@ config_groups {
       }
     }
   }
-  additional_modes {
-    name: "QUICK_DRY_RUN"
-    cq_label_value: 1
-    triggering_label: "Quick-Run"
-    triggering_value: 1
-  }
-  tryjob_experiments {
-    name: "chromium_rts.dry_run_rts"
-    condition {
-      owner_group_allowlist: "rts-on-dry-run"
-    }
-  }
 }

infra/config/subprojects/chromium/try.star

@@ -114,16 +114,7 @@ luci.cq_group(
             groups = "project-chromium-tryjob-access",
         ),
     ],
-    additional_modes = [
-        cq.run_mode(cq.MODE_QUICK_DRY_RUN, 1, "Quick-Run", 1),
-    ],
     tree_status_host = "chromium-status.appspot.com" if settings.is_main else None,
-    tryjob_experiments = [
-        cq.tryjob_experiment(
-            name = "chromium_rts.dry_run_rts",
-            owner_group_allowlist = ["rts-on-dry-run"],
-        ),
-    ],
 )
 
 # Declare a CQ group that watches all branch heads, excluding the active