[ci/python] Dedupe PyPI stubs

[johnkerl]

This is a preliminary PR to go underneath the (now WIP) #701. (See also tracking issue #700.)

Unlike #701, it doesn't attempt to implement anything that doesn't currenly exist. Rather, it maintains the manual wheel flow from
https://github.com/single-cell-data/TileDB-SOMA/wiki/PyPI-packaging-WIP
and simply:

• Removes a redundant step from python-ci.yml
• Leaves CI per se in python-ci.yml and leaves Python package in python-packaging.yml
• Updates the to-do stubs with my current understanding of where we're going

[codecov-commenter]

Codecov Report

Base: 71.70% // Head: 58.86% // Decreases project coverage by -12.84% ⚠️

Coverage data is based on head (72bd342) compared to base (9acb52c).
Patch has no changes to coverable lines.

❗ Current head 72bd342 differs from pull request most recent head 805a1af. Consider uploading reports for the commit 805a1af to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #704       +/-   ##
===========================================
- Coverage   71.70%   58.86%   -12.85%     
===========================================
  Files          70       38       -32     
  Lines        3768     1556     -2212     
===========================================
- Hits         2702      916     -1786     
+ Misses       1066      640      -426     

Flag	Coverage Δ
python	?
r	58.86% <ø> (ø)

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Impacted Files	Coverage Δ
apis/python/src/tiledbsoma/tiledb_object.py
apis/python/src/tiledbsoma/collection.py
apis/python/src/tiledbsoma/logging.py
...python/src/tiledbsoma/experiment_query/__init__.py
apis/python/src/tiledbsoma/util_arrow.py
apis/python/src/tiledbsoma/somacore/data.py
...pis/python/src/tiledbsoma/experiment_query/axis.py
apis/python/src/tiledbsoma/somacore/__init__.py
apis/python/src/tiledbsoma/experiment.py
apis/python/src/tiledbsoma/io.py
... and 22 more

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[thetorpedodog]

Looks pretty good overall but I defer to @mlin who is much better at this packaging thing than I am.

[mlin]

LGTM this comes down to just comments, right? To be clear, I definitely think we should automate the PyPI publishing once we're comfortable all the cibuildwheel stuff is working reliably and to our satisfaction. Now would be fine, except it will probably take a couple of hours of trial-and-error and maybe we're all juggling too much this week. Also happy to circle back on it later this month.

[johnkerl]

this comes down to just comments

@mlin no, at https://github.com/single-cell-data/TileDB-SOMA/pull/704/files there are guidance (in the form of comments) as well as deduping -- removing no-longer-used (legacy from main-old) wheels stanza from python-ci.yml