RFR: 8346109: Create JDK taglet for additional preview notes

[Hannes Wallnöfer]

On Tue, 8 Apr 2025 18:08:57 GMT, Chen Liang <liach at openjdk.org> wrote:

>> The else block generates the closing tag for the note. As you see in the PR description, the tag syntax resembles HTML open/close tags. This is a compromise to be able to locate the note within the description (which isn't possible with block tags), and being able to use rich content in the note without being required to writing a dedicated tag parser and rendering code. (I also happen to find this syntax easier to read than a custom inline tag, which would require additional rules to separate meta data from note content.)
>
> Such usage should be reflected in `testPreviewNoteTag`, which currently does not use it as open/close tags.

The problem is the Taglet class is part of the build system, and I don't think we have a way to test these build classes (I coulndn't find any tests for the other build Taglets). I could replicate the Taglet class in the test, but that doesn't seem like a good solution either.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23395#discussion_r2033795505