perf: collapse triple OfType().FirstOrDefault() into single foreach in JUnitXmlWriter #6052

var stateProperty = testNode.Properties.AsEnumerable()
    .OfType<TestNodeStateProperty>().FirstOrDefault();

var timingProperty = testNode.Properties.AsEnumerable()
    .OfType<TimingProperty>().FirstOrDefault();

var testMethodIdentifier = testNode.Properties.AsEnumerable()
    .OfType<TestMethodIdentifierProperty>().FirstOrDefault();

TestNodeStateProperty? stateProperty = null;
TimingProperty? timingProperty = null;
TestMethodIdentifierProperty? testMethodIdentifier = null;
foreach (var prop in testNode.Properties)
{
    if (stateProperty is null && prop is TestNodeStateProperty s) stateProperty = s;
    else if (timingProperty is null && prop is TimingProperty t) timingProperty = t;
    else if (testMethodIdentifier is null && prop is TestMethodIdentifierProperty m) testMethodIdentifier = m;
    if (stateProperty is not null && timingProperty is not null && testMethodIdentifier is not null) break;
}