Add infra jobs to capture more Android perf data

* Added a job for Pixel6 ganesh GL perf metric gathering (helpful for comparison against graphite). In any case, the Pixel 5 and 6 have very different GPUs, so this seems worthwhile.

* Pixel 7 devices are currently not used for any jobs. Added jobs to gather perf data for ganesh GL, ganesh vulkan, graphite native vulkan, and graphite dawn vulkan.

* Pixel 6 and 7 GPUs are more similar than the Pixel 5->6 ones, so arguably some of the newly-added Pixel7 jobs may be somewhat redundant, but gathering performance data on the most modern Pixel we have in stock seems reasonable - especially given that graphite tries to leverage modern GPU features.

* This will aid in perf comparisons for:
 - ganesh GL v. ganesh vulkan v. graphite native Vulkan on Pixel6 & 7
 - graphite native vulkan versus dawn vulkan on the Pixel7
 - Pixel 6 v Pixel 7 of different configs
   - If they are very similar, we could perhaps remove perf metric
     gathering for either device.

Change-Id: Ic072a14862020e76b0c27f2082dfdae113bf0256
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/894682
Reviewed-by: Kaylee Lubick <kjlubick@google.com>
Commit-Queue: Nicolette Prevost <nicolettep@google.com>
2 files changed