Add benchmark metrics to iOS CI pipeline

[google-labs-jules]

This PR adds benchmark measurements for the VM bytecode translation and native iOS compilation steps in the CI pipeline.

Changes

• scripts/build-ios-app.sh: Added timing for the ./mvnw package command which performs the Bytecode to C translation. The duration is saved to vm_time.txt in the artifacts directory.
• scripts/run-ios-ui-tests.sh: Added timing for the xcodebuild command. The VM time is read from the artifacts, and both times are exported as environment variables (CN1SS_VM_TIME, CN1SS_COMPILATION_TIME).
• scripts/lib/cn1ss.sh: Updated the screenshot processing helper to pass these environment variables as arguments to the Java reporting tool.
• scripts/common/java/RenderScreenshotReport.java: Added support for --vm-time and --compilation-time arguments. The report now includes a "Benchmark Results" section displaying these durations. Logic was updated to ensure the success message is still displayed when appropriate, even when benchmark data is present.

Example Output

The PR comment will now include a section like:

### Benchmark Results

- **VM Translation Time:** 123 seconds
- **Compilation Time:** 456 seconds

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PR created automatically by Jules for task 8027837712868060644 started by @shai-almog

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[shai-almog]

iOS screenshot updates

Compared 30 screenshots: 27 matched, 2 updated, 1 missing reference.

• BrowserComponent — updated screenshot. Screenshot differs (1206x2622 px, bit depth 8).

  
  Preview info: Preview provided by instrumentation.
  Full-resolution PNG saved as BrowserComponent.png in workflow artifacts.

• graphics-draw-gradient — updated screenshot. Screenshot differs (1206x2622 px, bit depth 8).

  
  Preview info: JPEG preview quality 10; JPEG preview quality 10; downscaled to 844x1835.
  Full-resolution PNG saved as graphics-draw-gradient.png in workflow artifacts.

• graphics-draw-round-rect — missing reference. Reference screenshot missing at /Users/runner/work/CodenameOne/CodenameOne/scripts/ios/screenshots/graphics-draw-round-rect.png.

  
  Preview info: JPEG preview quality 10; JPEG preview quality 10; downscaled to 844x1835.
  Full-resolution PNG saved as graphics-draw-round-rect.png in workflow artifacts.

Benchmark Results

• VM Translation Time: 326 seconds
• Compilation Time: 110 seconds

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