Drop redundant C++ and Python style check workflows

[ndgrigorian]

The C++ and Python style check workflows are redundant with the pre-commit workflow, and the C++ style check workflow has been problematic recently by changing to a clashing clang-format version

This PR proposes dropping both workflows, leaving only the pre-commit workflow

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[github-actions]

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

[coveralls]

coverage: 86.276% (-0.001%) from 86.277%
when pulling ccae634 on drop-python-cpp-style-check-workflows
into 091beaa on master.

[github-actions]

Array API standard conformance tests for dpctl=0.22.0dev0=py310h93fe807_18 ran successfully.
Passed: 1113
Failed: 8
Skipped: 119