RFR: 8340818: Add a new jtreg test root to test the generated documentation [v9]

[Nizar Benalla]

On Wed, 16 Oct 2024 15:39:08 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> Nizar Benalla has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Remove usage of TIDY_HOME, replace with TIDY
>>   Revert changes to RunTestsPrebuiltSpec.gmk
>>   Add TEST_DEPS to InitSupport.gmk
>
> test/docs/req.flg line 1:
> 
>> 1: echo_file test/TEST.properties
> 
> What is this for? I see that there is a similar file for the `jdk` test suite, but it says `echo_file test/TEST.ROOT`.

I will admit that I only added it because I saw it in the other test suits, I wanted to keep the same structure.

I can remove it if it seems redundant.

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PR Review Comment: https://git.openjdk.org/jdk/pull/21272#discussion_r1803372055