RFR: 8374754: jtreg failure handler - replace inline javascript and inline event handlers with same origin javascript files

[Jaikiran Pai]

Can I please get a review of this change to the jtreg failure handler that we use in the JDK? As noted in https://bugs.openjdk.org/browse/JDK-8374754 this change addresses the HTML rendering issues that are noticed in certain setups. The change here moves the inline javascript to a file of its own (generated as and when necessary).

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Commit messages:
 - 8374754: jtreg failure handler - replace inline javascript and inline event handlers with same origin javascript files

Changes: https://git.openjdk.org/jdk/pull/29106/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29106&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8374754
  Stats: 155 lines in 4 files changed: 92 ins; 39 del; 24 mod
  Patch: https://git.openjdk.org/jdk/pull/29106.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29106/head:pull/29106

PR: https://git.openjdk.org/jdk/pull/29106