Attempts to sign frameworks and runner app

Attempts to adhoc code sign the runner app itself and
its bundled frameworks during UI Testing to resolve
[ios_xctestrun_runner] codesigning/entitlements blockers bazelbuild#1912

apple/testing/default_runner/ios_xctestrun_runner.template.sh

@@ -149,6 +149,22 @@ if [[ -n "$test_host_path" ]]; then
  cp -R "$libraries_path/PrivateFrameworks/XCUIAutomation.framework" "$runner_app_frameworks_destination/XCUIAutomation.framework"
  cp -R "$libraries_path/PrivateFrameworks/XCTAutomationSupport.framework" "$runner_app_frameworks_destination/XCTAutomationSupport.framework"
  cp -R "$libraries_path/PrivateFrameworks/XCUnit.framework" "$runner_app_frameworks_destination/XCUnit.framework"
+ entitlements_path=$"$runner_app_destination/RunnerEntitlements.plist"
+ find "$runner_app_frameworks_destination" \
+ -name "*.framework" \
+ -exec codesign \
+ -f \
+ --entitlements \
+ "$entitlements_path" \
+ --timestamp=none \
+ -s - {} \; 2> "$test_tmp_dir/codesign_frameworks_stderr_logs.txt"
+ codesign \
+ -f \
+ --entitlements \
+ "$entitlements_path" \
+ --timestamp=none \
+ -s - "$runner_app_destination" \
+ 2> "$test_tmp_dir/codesign_runner_app_stderr_logs.txt"
  fi
 else
  xctestrun_test_host_path="__PLATFORMS__/iPhoneSimulator.platform/Developer/Library/Xcode/Agents/xctest"