[CPU][ARM] Fix GridSample tests for integral data

[aobolensk]

Details:

Keep ARM GridSample with integral input data on the reference path instead of decomposing it through floating-point arithmetic, since that changes rounding behavior for i32 outputs.

ARM_smoke/GridSampleLayerTestCPU tests are fixed

Tickets:

• N/A

AI Assistance:

• AI assistance used: yes
• The implementation is agentically assisted, manually adjusted after that and checked using the func tests

[aobolensk]

@allnes @v-Golubev please take a look