Fix inconsistency system git and conda env

[oleksandr-pavlyk]

Using system git in conda environment may be problematic due to inconsistency in dependent libraries.

For example, #1000 and #999 were affected by this:

03:35:37.053600 git.c:460               trace: built-in: git clone https://github.com/oneapi-src/level-zero.git
Cloning into 'level-zero'...
03:35:37.060849 run-command.c:655       trace: run_command: git remote-https origin https://github.com/oneapi-src/level-zero.git
03:35:37.063415 git.c:750               trace: exec: git-remote-https origin https://github.com/oneapi-src/level-zero.git
03:35:37.063456 run-command.c:655       trace: run_command: git-remote-https origin https://github.com/oneapi-src/level-zero.git
/usr/lib/git-core/git-remote-https: symbol lookup error: /lib/x86_64-linux-gnu/libp11-kit.so.0: undefined symbol: ffi_type_pointer, version LIBFFI_BASE_7.0

This library version mismatch caused git to silently return with status code 128, and took using GIT_TRACE=true to pin-point the cause.

This PR:

• add git to conda host environment

• Expands fatal error messages after execute_process to output process return code

• avoid calling to setup.py clean in build.sh if _skbuild/ folder does not exist

• 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?

[github-actions]

View rendered docs @ https://intelpython.github.io/dpctl/pulls/1001/index.html

[coveralls]

Coverage remained the same at 81.999% when pulling 701f708 on fix-inconsistency-system-git-and-conda-env into 7690952 on master.

[github-actions]

Array API standard conformance tests for dpctl=0.14.0=py310h8c27c75_10 ran successfully.
Passed: 33
Failed: 801
Skipped: 3138

[github-actions]

Deleted rendered PR docs from intelpython.github.com/dpctl, latest should be updated shortly. 🤞

[github-actions]

Array API standard conformance tests for dpctl=0.14.0=py310h8c27c75_10 ran successfully.
Passed: 33
Failed: 801
Skipped: 3138