fix(ci): exclude iosOnly flows from Android pre-filter

The Android pre-filter was only excluding "flakyAndroid" on top of the
user-supplied EXCLUDE_TAGS — it never excluded the platform-scope tag
"iosOnly", so any flow tagged iosOnly was being run on the Android
emulator anyway. Caught by the new google-sso-from-forgot-password
flow, which is correctly tagged iosOnly but failed on Android because
the system OAuth presentation strings ("Wants to Use" /
"accounts.google.com" / "Continue") never appear there.

iOS already had the symmetric guard ("$EXCLUDE_TAGS,androidOnly").

Author: chriscanin

.github/workflows/mobile-e2e.yml

@@ -561,7 +561,7 @@ jobs:
           script: >-
             adb install -r /tmp/cached-app-release.apk &&
             cd integration/mobile &&
-            excluded="$EXCLUDE_TAGS,flakyAndroid" &&
+            excluded="$EXCLUDE_TAGS,iosOnly,flakyAndroid" &&
             pattern="$(echo "$excluded" | sed 's/,/|/g')" &&
             find flows -type f -name '*.yaml' ! -path '*/common/*' ${FLOWS_FILTER:+-path "*$FLOWS_FILTER*"}
             | while read f; do grep -qE "^[[:space:]]*-[[:space:]]*(${pattern})[[:space:]]*$" "$f" || printf '%s\n' "$f"; done