[code coverage] Delete existing schedule of linux-code-coverage

This CL deletes the existing schedule of linux-code-coverage to favor
the specific coverage scheduler that triggers a build every 6h.

Bug: 1016929
Change-Id: I2aa7896860f5602d25f6da34ab6e47c318d8fb14
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1974893Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733770}

infra/config/generated/luci-scheduler.cfg

@@ -362,7 +362,6 @@ trigger {
   triggers: "linux-blink-heap-verification"
   triggers: "linux-chromeos-dbg"
   triggers: "linux-chromium-tests-staging-builder"
-  triggers: "linux-code-coverage"
   triggers: "linux-archive-dbg"
   triggers: "linux-gcc-rel"
   triggers: "linux-ozone-rel"
@@ -2554,16 +2553,6 @@ job {
   }
 }
 
-job {
-  id: "linux-code-coverage"
-  acl_sets: "default"
-  buildbucket: {
-    server: "cr-buildbucket.appspot.com"
-    bucket: "luci.chromium.ci"
-    builder: "linux-code-coverage"
-  }
-}
-
 job {
   id: "linux-archive-dbg"
   acl_sets: "default"

infra/config/luci-scheduler.cfg

@@ -362,7 +362,6 @@ trigger {
   triggers: "linux-blink-heap-verification"
   triggers: "linux-chromeos-dbg"
   triggers: "linux-chromium-tests-staging-builder"
-  triggers: "linux-code-coverage"
   triggers: "linux-archive-dbg"
   triggers: "linux-gcc-rel"
   triggers: "linux-ozone-rel"
@@ -2554,16 +2553,6 @@ job {
   }
 }
 
-job {
-  id: "linux-code-coverage"
-  acl_sets: "default"
-  buildbucket: {
-    server: "cr-buildbucket.appspot.com"
-    bucket: "luci.chromium.ci"
-    builder: "linux-code-coverage"
-  }
-}
-
 job {
   id: "linux-archive-dbg"
   acl_sets: "default"