Address CI warnings to not use nodefaults channel

[oleksandr-pavlyk]

Remove use of nodefaults channel, use conda-remove-defaults: true instead

This change is prompted by CI warning:

'nodefaults' channel detected: will remove 'defaults' if added implicitly.
In the future, 'nodefaults' as a way of removing 'defaults' won't be
supported. Please set 'conda-remove-defaults' = 'true' to remove this warning.

---

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[github-actions]

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

[ndgrigorian]

Warnings are gone, LGTM

[github-actions]

Array API standard conformance tests for dpctl=0.19.0dev0=py310hdf72452_220 ran successfully.
Passed: 894
Failed: 1
Skipped: 119

[coveralls]

coverage: 87.725%. remained the same
when pulling 60da3e7 on maint-conda-package-workflow-file
into 34ae129 on master.

[oleksandr-pavlyk]

Deprecation warnings are gone. Future warnings are still present, but the log does not show defaults channel being active even though it may be temporarily added to the list of channels by conda.

[github-actions]

Array API standard conformance tests for dpctl=0.19.0dev0=py310hdf72452_240 ran successfully.
Passed: 895
Failed: 0
Skipped: 119

[antonwolfy]

Thank you @oleksandr-pavlyk, LGTM!

[ndgrigorian]

Unfortunately, the deprecated warnings appear to be back, for the Windows step

[ndgrigorian]

I misread in my last comment, it was the future warnings. LGTM!