RFR: 8347826: Introspector shows wrong method list after 8071693

[Roman Marchenko]

Fixed `com.sun.beans.introspect.MethodInfo#MethodOrder` to make `Introspector.addMethod()` working properly when filtering methods out.

Also fixed the test, and added the approptiate test case.

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Commit messages:
 - fix

Changes: https://git.openjdk.org/jdk/pull/23443/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23443&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8347826
  Stats: 118 lines in 2 files changed: 64 ins; 6 del; 48 mod
  Patch: https://git.openjdk.org/jdk/pull/23443.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23443/head:pull/23443

PR: https://git.openjdk.org/jdk/pull/23443