[llvm] [OpenMP][NFC] Add min/max threads/teams count into the KernelEnvironment (PR #70257)

[Mehdi Amini via llvm-commits]

joker-eph wrote:

Seems like this broke the MLIR bot, the  `omptarget-region-device-llvm.mlir` is failing?
(the premiere test showed the issue here)

https://github.com/llvm/llvm-project/pull/70257