xDS interop: Python LB tests build and use the python server (1.48.x backport) #30655
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Backport of #30637
Undoes #27096.
While we lost context why py tests were used pinned cpp server,
we think this is due to lack of support of the set_not_serving RPC
in the python server, see #30635.
This RPC is only used in two tests, and for them we added a
temporary override of the test server to the reference Java server,
see #30636.
All other LB tests should work with the python server just fine.