[python/docs] Replace experiment directories with .tgz files in source control

[johnkerl]

Issue and/or context: As tracked on issue #2407 / [sc-51048].

Note that the intended Python and R API changes are all agreed on and finalized as described in #2407.

Changes:

As I noted on #3294 it's awkward and unnecessary to have full experiment directories in source control.

Here I commit the .tgz files to source control, and make the necessary adjustments to our tutorial notebooks.

Notes for Reviewer:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.40%. Comparing base (762abda) to head (648ac14).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3295      +/-   ##
==========================================
+ Coverage   85.29%   85.40%   +0.10%     
==========================================
  Files          52       52              
  Lines        5517     5517              
==========================================
+ Hits         4706     4712       +6     
+ Misses        811      805       -6     

Flag	Coverage Δ
python	85.40% <ø> (+0.10%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
python_api	85.40% <ø> (+0.10%)	⬆️
libtiledbsoma	∅ <ø> (∅)