RFR: 7903931: Add "jtreg.ttf" property to filter tests based on test thread factory value

[Leonid Mesnik]

On Mon, 27 Jan 2025 11:32:54 GMT, Christian Stein <cstein at openjdk.org> wrote:

> The namespace `jtreg.` is not used in `RegressionContext` yet, but it makes sense to introduce it here.
> 
> Is `ttf` a good abbreviation for `test thread factory` though? Would `jtreg.testThreadFactory` be too long in filter expressions?

I think `jtreg.ttf` is good enough, but might be becasue I know the context. If you feel that for all jtreg users `jtreg.testThreadFactory`, I am fine with this.

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PR Comment: https://git.openjdk.org/jtreg/pull/242#issuecomment-2616294135