RFR: JDK-8296240: Augment discussion of test tiers in doc/testing.md [v2]

[David Holmes]

On Thu, 26 Oct 2023 19:38:55 GMT, Joe Darcy <darcy at openjdk.org> wrote:

>> Clarify the intention of tier 1 tests. I'll reflow the paragraph and regenerate the HTML file once the wording is agreed upon.
>
> Joe Darcy has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Implement review feedback.

In many cases new tests just end up in tier1 by default, and nobody really measures how long they take to execute. If they later seem to take excessively long they can get moved or split.

Also note that in general it is very awkward for a test writer/updater to actually tell which tier the test will run in, or what flags/options might be applied to it in different tiers. So while I appreciate the sentiment here, problematic tests are normally noticed after the fact by the people who monitor such things.

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PR Comment: https://git.openjdk.org/jdk/pull/16384#issuecomment-1782367195