RFR: 8345353: Test for JDK-8344800 W3C DTDs and XSDs in the built-in Catalog [v2]

[Joe Wang]

> Add test for JDK-8344800 W3C DTDs and XSDs in the built-in Catalog

Joe Wang has updated the pull request incrementally with one additional commit since the last revision:

  remove unnecessary checks

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Changes:
  - all: https://git.openjdk.org/jdk/pull/22506/files
  - new: https://git.openjdk.org/jdk/pull/22506/files/f6f8f0f6..1e89c559

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22506&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22506&range=00-01

  Stats: 6 lines in 1 file changed: 0 ins; 4 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/22506.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22506/head:pull/22506

PR: https://git.openjdk.org/jdk/pull/22506