RFR: 8354084: Streamline XPath API's extension function control [v5]

[Joe Wang]

> Streamline the extension function control in the XPath API by relying solely on [XPathFunctionResolver](https://docs.oracle.com/en/java/javase/24/docs/api/java.xml/javax/xml/xpath/XPathFunctionResolver.html), which provides a secure and developer-defined mechanism. Remove the feature FEATURE_SECURE_PROCESSING and jdk.xml.enableExtensionFunctions from the decision path that are redundant with regard to XPath's Extension Functions.
> 
> Note the comment in JAXPExtensionsProvider, starting at  "JAXP 1.3 spec says When ...", was not accurate. Refer to the spec: https://docs.oracle.com/en/java/javase/24/docs/api/java.xml/javax/xml/XMLConstants.html#FEATURE_SECURE_PROCESSING, FSP does not have specific requirement for the XPath functions.
> 
> Tests:
>     Tier1 - 3 passed with regard to this change. There were unrelated/known failures (e.g. bug8329757).
>     JCK passed except the previously reported issue (JCK-7322355).

Joe Wang has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains five additional commits since the last revision:

 - Merge branch 'master' into JDK-8354084
 - update javadoc for the jdk.xml.enableExtensionFunctions property
 - rewind resource files, leave them to L10n resource files update
 - add copyright and docs
 - 8354084: Streamline XPath API's extension function control

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/24605/files
  - new: https://git.openjdk.org/jdk/pull/24605/files/4f26a489..8359153c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24605&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24605&range=03-04

  Stats: 179596 lines in 307 files changed: 10747 ins; 168002 del; 847 mod
  Patch: https://git.openjdk.org/jdk/pull/24605.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24605/head:pull/24605

PR: https://git.openjdk.org/jdk/pull/24605