[iOS][infra] Run tests in iOS14 runtimes on ios-simulator-full-configs

Replicated iOS 13.6 form factors to iOS 14 in the full-configs CQ bot.
Moved iOS12 runtimes on full configs bot to ios-simulator-noncq for
capacity restrain.

Bug: 1123108
Change-Id: I34109ef9278b916de94457b12f4c247eac54d073
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2382223Reviewed-by: Justin Cohen <justincohen@chromium.org>
Reviewed-by: Garrett Beaty <gbeaty@chromium.org>
Commit-Queue: Zhaoyang Li <zhaoyangli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802873}

testing/buildbot/test_suites.pyl

@@ -5712,19 +5712,21 @@
       'ios_eg2_tests': {
         'mixins': ['xcode_parallelization'],
         'variants': [
-          'SIM_IPAD_AIR_2_12_4',
-          'SIM_IPHONE_X_12_4',
           'SIM_IPHONE_7_13_6',
           'SIM_IPAD_AIR_2_13_6',
           'SIM_IPHONE_X_13_6',
+          'SIM_IPHONE_7_14_0',
+          'SIM_IPAD_AIR_2_14_0',
+          'SIM_IPHONE_X_14_0',
         ]
       },
       'ios_eg2_cq_tests': {
         'mixins': ['xcode_parallelization'],
         'variants': [
-          'SIM_IPAD_AIR_2_12_4',
           'SIM_IPHONE_7_13_6',
           'SIM_IPAD_AIR_2_13_6',
+          'SIM_IPHONE_7_14_0',
+          'SIM_IPAD_AIR_2_14_0',
         ]
       }
     },
@@ -5764,9 +5766,9 @@
     # and removes failing ones from ios14-sdk-simulator.
     # The result is test suites with certain tests removed,
     # identified by *_noncq.
-    # The list of variants to use is determined by
-    # ios-simulator and ios-simulator-full config's 12.4
-    # passing sims, converted to 14.0
+    # The list of variants are ios-simulator's 12.4 passing
+    # sims converted to 14.0, and 12.4 sims used to be on
+    # ios-simulator-full-configs.
     'ios_simulator_noncq_tests': {
       'ios_common_tests': {
         'mixins': [
@@ -5779,17 +5781,16 @@
       'ios_eg2_tests': {
         'mixins': ['xcode_parallelization'],
         'variants': [
+          'SIM_IPAD_AIR_2_12_4',
+          'SIM_IPHONE_X_12_4',
           'SIM_IPHONE_6S_14_0',
-          'SIM_IPAD_AIR_2_14_0',
-          'SIM_IPHONE_X_14_0',
         ]
       },
       'ios_eg2_cq_tests': {
         'mixins': ['xcode_parallelization'],
         'variants': [
+          'SIM_IPAD_AIR_2_12_4',
           'SIM_IPHONE_6S_14_0',
-          'SIM_IPAD_AIR_2_14_0',
-          'SIM_IPHONE_X_14_0',
         ]
       },
       'ios_screen_size_dependent_tests': {