[code coverage] Add all unit tests and EG2 tests to iOS coverage builder

iOS common tests are already running on this builder. This CL adds other
unit tests and EG2 tests as designed to run on this builder.

Bug: 943883
Change-Id: Idff82abb809642d814a87bd6d9dec281b84f7751
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2122847Reviewed-by: Aaron Gable <agable@chromium.org>
Commit-Queue: Zhaoyang Li <zhaoyangli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754081}

testing/buildbot/test_suites.pyl

@@ -4763,6 +4763,16 @@
           'SIM_IPHONE_X_13_3',
         ],
       },
+      'ios_eg2_tests': {
+        'variants': [
+          'SIM_IPHONE_X_13_3',
+        ],
+      },
+      'ios_screen_size_dependent_tests': {
+        'variants': [
+          'SIM_IPHONE_X_13_3',
+        ],
+      },
     },
 
     'ios_simulator_cronet_tests': {