Fix using xcresulttool on Xcode 16.0 beta 3+

[priitlatt]

With Xcode 16.0 beta 3+ part of xcresulttool API that we use to parse Xcode test results has been deprecated:

% xcrun xcresulttool get object --help
OVERVIEW: Get Result Bundle Object. This subcommand is deprecated and will be removed in a future release, consider using `xcresulttool get test-report` instead.

USAGE: xcresulttool get object [--legacy] --path <path> [--id <id>] [--version <version>] [--format <format>]
...

This causes xcresulttool get object calls with recent Xcode versions to exit with error and consequently some actions in xcode-project fail.

Apple has provided a quick workaround by providing --legacy flag that can be used to still use the old API even on more recent xcresulttool version. Changes on this PR make use of that flag when calling xcresulttool get object in case xcresulttool version is at least 23021.

Updated actions:

• xcode-project run-tests
• xcode-project test-summary
• xcode-project junit-test-results

QA notes

Test are running and results can be successfully parsed using the following Xcode versions:

• ✅ Xcode 15.3 (15E204a)
• ✅ Xcode 15.4 (15F31d)
• ✅ Xcode 16.0 (16A5211f)

[mohammedbabelly20]

LGTM 🚀

[mohammedbabelly20]

Suggested change

	Starting from Xcode 16 beta 3 'xcresulttool get --format json' has been deprecated and
	cannot be used without '--legacy' flag.
	Starting from Xcode 16 beta 3 'xcresulttool get' has been deprecated and
	cannot be used without '--legacy' flag.

[priitlatt]

Actually xcresulttool get itself is not deprecated. Up until version 23021 it used to just output the result bundle object, but now there are couple of subcommands that can be used, with objects being the default.