jmx-dev RFR: 8351413: Remove XML interchange in java.management/javax/management/modelmbean/DescriptorSupport

[Kevin Walls]

Removal of an obscure historical feature, following on from its deprecation for removal in:

8347433: Deprecate XML interchange in java.management/javax/management/modelmbean/DescriptorSupport for removal

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Commit messages:
 - 8351413: Remove XML interchange in java.management/javax/management/modelmbean/DescriptorSupport

Changes: https://git.openjdk.org/jdk/pull/25697/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25697&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8351413
  Stats: 649 lines in 6 files changed: 0 ins; 644 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/25697.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25697/head:pull/25697

PR: https://git.openjdk.org/jdk/pull/25697