Remove atomic emulation

[ZzEeKkAa]

Since DPCPP now supports atomics, we don't need to emulate them by ourselves.

• Have you provided a meaningful PR description?
• Have you added a test, reproducer or referred to an issue with a reproducer?
• Have you tested your changes locally for CPU and GPU devices?
• Have you made sure that new changes do not introduce compiler warnings?
• If this PR is a work in progress, are you filing the PR as a draft?

Fixes: #760
Fixes: #650
Fixes: #868
Fixes: #1068

[ZzEeKkAa]

This PR should unblock these checks:
IntelPython/dpbench#289

[diptorupd]

The run_test.sh script in the conda-recipe directory should be updated as well.

The documentation page
https://github.com/IntelPython/numba-dpex/blob/main/docs/source/user_guide/kernel_programming/atomic-operations.rst should be updated as well.

Please test #1068, #774, #711 as well with this PR.

[diptorupd]

@ZzEeKkAa in a subsequent PR can you push changes to remove the dependency on spirv-tools?

[github-actions]

Documentation preview: show.

[ZzEeKkAa]

#650 tested:

> set NUMBA_DPPY_DEBUG=1
> dpbench -b gpairs -i numba_dpex_k run --no-skip-expected-failures

================ Benchmark GPairs (gpairs) ========================

================ implementation numba_dpex_k ========================
implementation: numba_dpex_k
framework: numba_dpex
framework version: 0.21.1+61.g7d9bcca0.dirty
input size: 8512
setup time: 219.6217ms (219621700 ns)
warmup time: 962.5928ms (962592800 ns)
teardown time: 101.4μs (101400 ns)
max execution times: 4.226ms (4226000 ns)
min execution times: 2.7134ms (2713400 ns)
median execution times: 3.15995ms (3159950 ns)
repeats: 10
preset: S
validated: Success

[ZzEeKkAa]

#1068 tested:

python test_1068.py
Using device ...
Device(level_zero:gpu:0)
Reduction sum = 11.
Done...

[ZzEeKkAa]

This change is ready to go. I've tested all the mentioned issues.

These issues simply does not make sense now: #760, #868, #711 does not work, see my latest comment there.

Changes applied

[github-actions]

Documentation preview removed.

[ZzEeKkAa]

@ZzEeKkAa in a subsequent PR can you push changes to remove the dependency on spirv-tools?

Did it here in a separate commit.