RFR: 8353749: Improve security warning when using JKS or JCEKS keystores [v2]

[Hai-May Chao]

> This PR improves security warning when using JKS or JCEKS keystores.

Hai-May Chao has updated the pull request incrementally with four additional commits since the last revision:

 - Updates with review comments
 - Updates with review comments
 - Revert changes to KeyStore.java
 - Remove test TestOutdatedKeyStore.java

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Changes:
  - all: https://git.openjdk.org/jdk/pull/27624/files
  - new: https://git.openjdk.org/jdk/pull/27624/files/560d4163..452e5cda

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27624&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27624&range=00-01

  Stats: 291 lines in 7 files changed: 73 ins; 186 del; 32 mod
  Patch: https://git.openjdk.org/jdk/pull/27624.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27624/head:pull/27624

PR: https://git.openjdk.org/jdk/pull/27624