ci: try to use macos-15 for iOS 26 e2e tests (#1393)

## 📜 Description

Use `macos-15` instead of `macos-26`.

## 💡 Motivation and Context

Looks like `macos-26` + iOS 26 are not stable yet at the moment:
actions/runner-images#13830

So in this PR I'm switching to `macos-15` instead. Also reverting
#1382
as it looks like it doesn't improve situation at all.

## 📢 Changelog

<!-- High level overview of important changes -->
<!-- For example: fixed status bar manipulation; added new types
declarations; -->
<!-- If your changes don't affect one of platform/language below - then
remove this platform/language -->

### CI

- removed changes introduced in
#1382
- switch to `macos-15` instead of `macos-26`;

## 🤔 How Has This Been Tested?

Tested via this PR (2x run).

## 📸 Screenshots (if appropriate):

<img width="664" height="176" alt="image"
src="https://github.com/user-attachments/assets/9d49733a-320e-41d4-8e21-105b58623c5b"
/>

## 📝 Checklist

- [x] CI successfully passed
- [x] I added new mocks and corresponding unit-tests if library API was
changed

Author: kirillzyusko

.github/workflows/ios-e2e-test.yml

@@ -114,10 +114,10 @@ jobs:
         run: |
           if [[ "${{ github.event_name }}" == "pull_request" ]]; then
             # Subset for PRs: Only ios 15, 26, 26e (adjust as needed)
-            echo 'matrix={"devices": [{"ios": 15, artifact: "16.4", "xcode": "16.4", "macos": 15, "runtime": "15.5", "iphone": "iPhone 13 Pro", "os": "15.5"}, {"ios": 17, artifact: "16.4", "xcode": "16.4", "macos": 15, "runtime": "17.5", "iphone": "iPhone 15 Pro", "os": "17.5"}, {"ios": "26e", artifact: "26.1", "xcode": "26.1", "macos": 26, "iphone": "iPhone 16e", "os": "26.1"}]}' >> $GITHUB_OUTPUT
+            echo 'matrix={"devices": [{"ios": 15, artifact: "16.4", "xcode": "16.4", "macos": 15, "runtime": "15.5", "iphone": "iPhone 13 Pro", "os": "15.5"}, {"ios": 17, artifact: "16.4", "xcode": "16.4", "macos": 15, "runtime": "17.5", "iphone": "iPhone 15 Pro", "os": "17.5"}, {"ios": "26e", artifact: "26.1", "xcode": "26.1", "macos": 15, "iphone": "iPhone 16e", "os": "26.1"}]}' >> $GITHUB_OUTPUT
           else
             # Full set for main
-            echo 'matrix={"devices": [{"ios": 15, artifact: "16.4", "xcode": "16.4", "macos": 15, "runtime": "15.5", "iphone": "iPhone 13 Pro", "os": "15.5"}, {"ios": 16, artifact: "16.4", "xcode": "16.4", "macos": 15, "runtime": "16.4", "iphone": "iPhone 14 Pro", "os": "16.4"}, {"ios": 17, artifact: "16.4", "xcode": "16.4", "macos": 15, "runtime": "17.5", "iphone": "iPhone 15 Pro", "os": "17.5"}, {"ios": 18, artifact: "16.4", "xcode": "16.4", "macos": 15, "iphone": "iPhone 16 Pro", "os": "18.5"}, {"ios": 26, artifact: "16.4", "xcode": "26.0", "macos": 26, "iphone": "iPhone 17 Pro", "os": "26.2"}, {"ios": "26e", artifact: "26.1", "xcode": "26.1", "macos": 26, "iphone": "iPhone 16e", "os": "26.1"}]}' >> $GITHUB_OUTPUT
+            echo 'matrix={"devices": [{"ios": 15, artifact: "16.4", "xcode": "16.4", "macos": 15, "runtime": "15.5", "iphone": "iPhone 13 Pro", "os": "15.5"}, {"ios": 16, artifact: "16.4", "xcode": "16.4", "macos": 15, "runtime": "16.4", "iphone": "iPhone 14 Pro", "os": "16.4"}, {"ios": 17, artifact: "16.4", "xcode": "16.4", "macos": 15, "runtime": "17.5", "iphone": "iPhone 15 Pro", "os": "17.5"}, {"ios": 18, artifact: "16.4", "xcode": "16.4", "macos": 15, "iphone": "iPhone 16 Pro", "os": "18.5"}, {"ios": 26, artifact: "16.4", "xcode": "26.0", "macos": 15, "iphone": "iPhone 17 Pro", "os": "26.2"}, {"ios": "26e", artifact: "26.1", "xcode": "26.1", "macos": 15, "iphone": "iPhone 16e", "os": "26.1"}]}' >> $GITHUB_OUTPUT
           fi
   e2e-test:
     name: ⚙️ Automated test cases (iOS-${{ matrix.devices.ios }}, XCode-${{ matrix.devices.artifact }})
@@ -138,25 +138,6 @@ jobs:
       - uses: maxim-lobanov/setup-xcode@v1
         with:
           xcode-version: ${{ matrix.devices.xcode }}
-      - name: Cleanup iOS simulator
-        run: |
-          echo "Before:"
-          df -h
-
-          # Kill simulator services
-          sudo killall -9 com.apple.CoreSimulator.CoreSimulatorService || true
-
-          # Unmount all runtime volumes
-          mount | grep CoreSimulator | awk '{print $1}' | while read disk; do
-            sudo diskutil unmount force "$disk" || true
-          done
-
-          # Clean everything
-          rm -rf ~/Library/Developer/CoreSimulator || true
-          rm -rf ~/Library/Developer/Xcode/DerivedData || true
-
-          echo "After cleanup:"
-          df -h
       - name: Get Xcode version
         run: xcodebuild -version
       # needed for additional runtime installation