Build: Test both on iPhone & iPad

Due to pre-existing commitments, test on iOS 8+ on an iPhone, but on an iPad
just test on the latest two iPadOS versions.

Ref jquery/jquery#5714
Ref jquery/jquery#5715

Author: mgol

.github/workflows/browserstack.yml

@@ -47,15 +47,31 @@ jobs:
           - 'Firefox_78'
           - 'Firefox_60'
           - 'Firefox_48'
-          - '__iOS_26'
-          - '__iOS_18'
-          - '__iOS_17'
-          - '__iOS_16'
-          - '__iOS_15'
-          - '__iOS_14'
-          - '__iOS_13'
-          - '__iOS_12'
-          - '__iOS_11'
+
+          - '_:iPhone 17_iOS_26'
+          - '_:iPhone 16_iOS_18'
+          - '_:iPhone 15 Pro_iOS_17'
+          - '_:iPhone 14_iOS_16'
+          - '_:iPhone 13_iOS_15'
+          - '_:iPhone 12_iOS_14'
+          - '_:iPhone 11_iOS_13'
+            # iOS 12 & older is not officially supported by BrowserStack as
+            # it mostly runs on emulators instead of real devices. We include
+            # those versions as long as they still work.
+          - '_:iPhone XS_iOS_12'
+          - '_:iPhone X_iOS_11'
+            # iOS 10 real device is in tier 4 as of January 2025 and its
+            # availability is poor, leading to frequent test timeouts. Emulators
+            # don't work either. Skip testing on this version.
+            # See https://www.browserstack.com/device-tiers
+            # - '_:iPhone 7_iOS_10'
+          - '_:iPhone 6S_iOS_9'
+          - '_:iPhone 6_iOS_8'
+            # iOS 7 emulators no longer work properly
+            # - '_:iPhone 5S_iOS_7'
+
+          - '_:iPad Air 13 2025_iOS_26'
+          - '_:iPad Air 13 2025_iOS_18'
 
           # iOS 10 is a tier 4 device as of January 2025 and its availability
           # is poor, leading to frequent test timeouts. Skip testing on it.