Re-enable java signalr tests in Helix

[wtgodbe]

Currently disabled here:

aspnetcore/src/SignalR/clients/java/signalr/test/signalr.client.java.Tests.javaproj

Lines 9 to 10 in 06b621d

	<!-- Skipping on Helix for now -->
	<BuildHelixPayload>false</BuildHelixPayload>

Likely due to the changed file layout after rearranging the folder layout in #25253

[wtgodbe]

Fixed by #25783