Remove new XML test cases added by e7192486d.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 896cd266fd34c2dfbf06297b9f2ea89ae8e5a0b1
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2024-07-09T20:31:24Z
Releases: 18.0
Remove new XML test cases added by e7192486d.

These turn out to produce libxml2-version-dependent error reports.
They aren't adding value that would justify dealing with that,
so just remove them again.  (I had in fact guessed wrong about
what versions matching xml_2.out would produce, but it doesn't
matter because there are other discrepancies.)

Per buildfarm.

Discussion: https://postgr.es/m/trinity-b0161630-d230-4598-9ebc-7a23acdb37cb-1720186432160@3c-app-gmx-bap25
Discussion: https://postgr.es/m/trinity-361ba18b-541a-4fe7-bc63-655ae3a7d599-1720259822452@3c-app-gmx-bs01

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