feat: Add xctest support

[rillgen-saucelabs]

Description

Adds xctest test type support. Unlike xcuitest it doesn't require a "test" .ipa but a xctestrun file which is an Apple plist format as a descriptor. Here is what the configuration looks like:

apiVersion: v1alpha
kind: xctest
sauce:
  metadata:
    build: XCUITest Basic
  concurrency: 1
xctest:
  app: /Users/ricardoillgen/projects/saucelabs/rdc-xcuitest-test/apps/FlutterTestApp.ipa
  xcTestRunFile: /Users/ricardoillgen/projects/saucelabs/rdc-xcuitest-test/FlutterTest.xctestrun
suites:
  - name: "Basic XCTest"
    devices:
      - name: $DEVICE_NAME
        platformVersion: $PLATFORM_VERSION
artifacts:
  download:
    when: always
    match:
      - junit.xml
    directory: ./

[alexplischke]

Json Schema

Missing json schema update 🙏 See https://github.com/saucelabs/saucectl/tree/68fdc19a9eec4c8282d372b9ac9b2d7ea73589af/api/v1alpha/framework for framework specific schemas.

After you make changes to the relevant schemas and include it in the global schema as well, the final combined schema has to be re-generated via make schema.

E2E Tests

We have at least one e2e test for each framework/workflow we support. Here's one for xcuitest. We'll need one for xctest as well 🙏

[alexplischke]

Suggested change

	// Xcuitest represents xcuitest apps configuration.
	// Xctest represents xctest apps configuration.

[alexplischke]

Just for consistency (since this const exists in both packages):

Suggested change

	RealDeviceKind: strings.ToLower(xcuitest.IOS),
	RealDeviceKind: strings.ToLower(xctest.IOS),