[OpenMP][OMPT] Fix `target enter data` callback ordering & reported device num This patch fixes: https://github.com/llvm/llvm-project/issues/64738 We observed multiple issues, primarily that the `DeviceId` was reported as -1 in certain scenarios. The reason for this is simply that the device is not initialized at that point. Hence, we need to move the RAII object creation just after the `checkDeviceAndCtors`, closer to the actual call we want to observe. This also solves an odering issue where one `target enter data` callback would be executed before the `Init` callback. Additionally, this change will also fix that the callbacks corresponding to `enter / exit data` and `update` in conjunction with `nowait` would not result in the emission of an OMPT callback. Added a testcase to cover initialized device number and `omp target` constructs. Reviewed By: dhruvachak Differential Revision: https://reviews.llvm.org/D157605
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