Initial Support for .xctestrun File Format Version 2

[bahrimootaz]

Description :
Enable the execution of XCTest cases using .xctestrun configuration files in version 2 format, expanding compatibility and aligning with latest Xcode standards.

Context :
Currently, go-ios supports .xctestrun files with format version 1. However, Xcode has introduced version 2 of the .xctestrun file format, which brings structural changes and enhancements. To maintain compatibility with modern XCTest setups and improve usability for customers, we need to support this newer format.

Reference: new structure of the .xctestrun is documented here

Testing :
In this MR we test did test the following scenarios :

• contains only a single XCTest 🟢
• contains multiple XCTest targeting the same app 🟢
• contains multiple XCTest targeting different apps 🟢

[rillgen-saucelabs]

I think this would effectivelly stop test executions if one has an error. I don't know if that's a good idea.

[bahrimootaz]

if we have tests that are erroring => no it won't stop execution of other tests if exists.
but if the failure because of something we do in the testmanagerd, it will stop execution => which is expected.

[dmissmann]

if there are two test targets and the first one returns an error here it won't execute the second one. So it would stop the execution.

I guess we can return both, the partial results and the error

var results []TestSuite
var targetErrors []error
for _, target := range xcTestTargets {
	suites, err := RunTestWithConfig(ctx, target)
	if err != nil {
		targetErrors = append(targetErrors, err)
		continue
	}
	...
}
return results, errors.join(targetErrors...)

[bahrimootaz]

@dmissmann nice idea, we implemented this