Bug 1697066 - [ci] Run ccov tasks with fission enabled, r=releng-reviewers,jmaher

Here's the task diff for mozilla-central:
+test-linux1804-64-ccov-qr/opt-mochitest-browser-chrome-swr-fis-e10s
-test-linux1804-64-ccov-qr/opt-mochitest-devtools-chrome-e10s
+test-linux1804-64-ccov-qr/opt-mochitest-devtools-chrome-fis-e10s
-test-linux1804-64-ccov-qr/opt-mochitest-plain-e10s
+test-linux1804-64-ccov-qr/opt-mochitest-plain-fis-e10s
+test-linux1804-64-ccov-qr/opt-mochitest-plain-fis-xorig-e10s
-test-linux1804-64-ccov-qr/opt-web-platform-tests-e10s
+test-linux1804-64-ccov-qr/opt-web-platform-tests-fis-e10s

Note we weren't previously running any ccov browser-chrome tasks on Linux so
that's why no task was removed on that configuration.

Differential Revision: https://phabricator.services.mozilla.com/D124400

taskcluster/ci/test/mochitest.yml

@@ -69,15 +69,18 @@ mochitest-plain:
                     (linux.*64|macosx.*64|windows10-64-2004)-qr/opt: ['autoland']
                     (linux.*64|macosx.*64|windows10-64-2004)-shippable-qr/opt: ['autoland', 'mozilla-central']
                     linux.*64(-asan|-tsan)-qr/opt: ['autoland', 'mozilla-central']
+                    linux.*64-ccov-qr/opt: ['mozilla-central']
                     default: []
             fission-xorigin:
                 by-test-platform:
                     (linux.*64|macosx.*64|windows10-64-2004)(-shippable)?-qr/(opt|debug): ['trunk']
+                    linux.*64-ccov-qr/opt: ['mozilla-central']
                     default: []
             default:
                 by-test-platform:
                     .*-tsan-qr/opt: ['trunk']
                     android-em-7.0-x86_64-qr/debug-isolated-process: []
+                    linux.*64-ccov-qr/opt: []
                     default: built-projects
     chunks:
         by-test-platform:
@@ -151,10 +154,12 @@ mochitest-browser-chrome:
             webrender-sw-fission:
                 by-test-platform:
                     linux.*64(-asan|-shippable)?-qr/(opt|debug): ['trunk']
+                    linux.*64-ccov-qr/opt: ['mozilla-central']
                     default: []
             default:
                 by-test-platform:
                     linux.*-qr/.*: []
+                    linux.*64-ccov-qr/opt: []
                     default: built-projects
     tier:
         by-variant:
@@ -302,10 +307,12 @@ mochitest-devtools-chrome:
                 by-test-platform:
                     linux.*64(-shippable)?-qr/(opt|debug): ['trunk']
                     windows10-64-2004(-shippable)?-qr/(opt|debug): ['trunk']
+                    linux.*64-ccov-qr/opt: ["mozilla-central"]
                     default: []
             default:
                 by-test-platform:
                     .*-tsan-qr/opt: ['trunk']
+                    linux.*64-ccov-qr/opt: []
                     default: built-projects
     tier:
         by-variant:

taskcluster/ci/test/web-platform.yml

@@ -83,11 +83,13 @@ web-platform-tests:
                     (linux.*64|windows10-64-2004)-qr/debug: ['trunk']
                     (linux.*64|windows10-64-2004)(-shippable)?-qr/opt: ['trunk']
                     linux.*64-(asan|tsan)(-qr)?/opt: ['trunk']
+                    linux.*64-ccov-qr/opt: ['mozilla-central']
                     default: []
             default:
                 by-test-platform:
                     .*-tsan-qr/opt: ['trunk']
                     android-em-7.0-x86_64-qr/debug-isolated-process: []
+                    linux.*64-ccov-qr/opt: []
                     default: built-projects
     mozharness:
         chunked: true