[MLIR][Transform] Don't error when a structurally inlinable call exists (#195770)
Fixes bug introduced in https://github.com/llvm/llvm-project/pull/192956
Specifically transform-interpreter would crash if any op in the region
it is applied to is marked as no-inline via the inliner interface. This
is because the check added does a post processing to verify that all
operations can be inlined [and there isn't an issue due to symbol
merging]. However, it fails to account for the case where an operation
was already not inlinable (and not an error introduced by the transform
symbol merging).