RFR: 8343001: Adjust XSLT and XPath Extension Function Property

[Joe Wang]

Disables XSLT and XPath Extension Functions by default, setting jdk.xml.enableExtensionFunctions to false.

Adjusted tests accordingly.

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Commit messages:
 - 8343001: Adjust XSLT and XPath Extension Function Property

Changes: https://git.openjdk.org/jdk/pull/22504/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22504&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8343001
  Stats: 408 lines in 19 files changed: 174 ins; 133 del; 101 mod
  Patch: https://git.openjdk.org/jdk/pull/22504.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22504/head:pull/22504

PR: https://git.openjdk.org/jdk/pull/22504