chore: tune values for platofrm add ios

Author: dtopuzov

tests/perf/data.json

@@ -2,7 +2,7 @@
   "hello-world-js": {
     "create": 19.4724953175,
     "platform_add_android": 5.98946801821,
-    "platform_add_ios": 6.48819526037,
+    "platform_add_ios": 7.66259102567,
     "android": {
       "build_incremental": 15.266872008641561,
       "build_initial": 113.7079525788625,

tests/perf/tooling/platform_add_perf_tests.py

@@ -11,7 +11,7 @@
 from products.nativescript.tns import Tns
 
 RETRY_COUNT = 3
-TOLERANCE = 0.20
+TOLERANCE = 0.30
 APP_NAME = Settings.AppName.DEFAULT
 EXPECTED_RESULTS = JsonUtils.read(os.path.join(Settings.TEST_RUN_HOME, 'tests', 'perf', 'data.json'))