Add tests to document preexisting behavior for SPARQL updates in wdqs-proxy

Lericksonrequested to merge
write-protection into main

The WDQS proxy currently doesn't do anything special with SPARQL updates. However, the implementation already guarded against them being passed through to the backend by expecting a Query object, vs an UpdateRequest.

Here I added some tests to document this. I will shortly update the behavior, but felt it was easier to be clear about what the system already did on its own first.

I also updated "labelQuery" to "inputQuery" in the existing test, since it's now more general than just label service queries.

@trueg @gmodena

Bug: T423104

Edited by Lerickson

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