🏗️ enable 3-at-a-time batching for all sauce labs tests (#27051)
🏗️ enable 3-at-a-time batching for all sauce labs tests (#27051)

* Run all sauce labs tests in 2-at-a-time batches

* enable 3-at-a-time batching for Sauce Labs tests

* Add clarifying comment about batch size

* Revert changes to remote-tests commands

* Limit browsers used in batches for --stable and--beta flags

* Merge browser logic

* Update comments

* dont change case, just apply filtering

* Flip conditionals
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