[flang][OpenMP] Add `OutlineableOpenMPOpInterface` to `omp.teams` (#131109)
Given the following input:
```fortran
program rep_loopbind
implicit none
integer :: i
real :: priv_val
!$omp teams private(priv_val)
!$omp distribute
do i=1,1000
end do
!$omp end teams
end program
```
the `AllocaOpConversion` pattern in `FIRToLLVMLowering` would **move**
the private allocations that belong to the `teams` directive (i.e. the
allocations needed for the private copies of `priv_val` and the loop's
iteration variable) from the the `omp.teams` op to the outside scope.
This is not correct since these allocations should be eventually emitted
inside the outlined region for the `teams` directive. Without this fix,
these allocation would be emitted in the parent function (or the parent
scope whatever it is).
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