RFR: JDK-8323628: Update license on "pass-through" files

[Hannes Wallnöfer]

On Fri, 12 Jan 2024 23:37:28 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

> Please review an update to change the license used on those files that get written by `javadoc` into any generated API doc bundles. The license is changed to the Universal Permissive License in all situations.
> 
> A new test is added to verify the license is found on all appropriate files in the `resource-files` and `script-files` directories. One test, to detect and check CSS classes, was modified to ignore a false positive in the new comment in the stylesheet.css file.

Looks good to me.

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Marked as reviewed by hannesw (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/17411#pullrequestreview-1850501614