Unable to disable attach debugger when generating TestAction with TestPlan

[Andrea-Scuderi]

Describe the bug and the expected behavior

The TestAction.testPlans(...) function doesn't allow to specify attachDebugger: false`
Example

...
Scheme(
                name: "\(name)UITests",
                shared: true,
                buildAction:  .buildAction(
                    targets: ["\(name)", "\(name)UITests"]
                ),
                testAction: .testPlans(
                    [.relativeToRoot("TestPlan/\(name)UITests.xctestplan")],
                    configuration: .debug,
                    preActions: [],
                    postActions: []
                )
 )
...

The outcome of the current behaviour consists in the generation of a schema with Debugger executable always checked.

Desired outcome:

Allow to specify the attachDebugger: false in TestAction.testPlans(...)

...
Scheme(
                name: "\(name)UITests",
                shared: true,
                buildAction:  .buildAction(
                    targets: ["\(name)", "\(name)UITests"]
                ),
                testAction: .testPlans(
                    [.relativeToRoot("TestPlan/\(name)UITests.xctestplan")],
                    configuration: .debug,
                    attachDebugger: false,
                    preActions: [],
                    postActions: []
                )
)
...

Motivation:

Attaching debugger during UI and UnitTest slows down the tests execution