improve notebook testing

[fnikolai]

Description

The notebook testing is now triggered not only during the nightly build but also when there are changes to notebooks under the examples directory. This adjustment is made to prevent notebook errors from silently entering the main branch. Although the nightly check can detect these errors, they have been overlooked in the past, leading to delayed error realization.

With the recent update, testing of notebooks will occur whenever there are changes to the notebooks. However, it's important to note that code changes may still impact the notebooks. Therefore, the nightly check is retained to ensure comprehensive testing.

Related Issues

Checklist

• Is this code covered by new or existing unit tests or integration tests?
• Did you run make test successfully?
• Do new classes, functions, methods and parameters all have docstrings?
• Were existing docstrings updated, if necessary?
• Was external documentation updated, if necessary?

Additional Notes or Comments

[codecov-commenter]

Codecov Report

Attention: 177 lines in your changes are missing coverage. Please review.

Comparison is base (34830a7) 80.33% compared to head (7f3d500) 79.62%.
Report is 56 commits behind head on main.

Files	Patch %	Lines
superduperdb/backends/ibis/query.py	52.17%	44 Missing ⚠️
superduperdb/components/stack.py	41.53%	38 Missing ⚠️
superduperdb/server/app.py	69.11%	21 Missing ⚠️
superduperdb/misc/server.py	26.66%	11 Missing ⚠️
superduperdb/vector_search/interface.py	67.64%	11 Missing ⚠️
superduperdb/base/build.py	57.14%	6 Missing ⚠️
superduperdb/cdc/cdc.py	62.50%	6 Missing ⚠️
superduperdb/cli/serve.py	54.54%	5 Missing ⚠️
superduperdb/backends/sqlalchemy/metadata.py	73.33%	4 Missing ⚠️
superduperdb/cli/stack.py	55.55%	4 Missing ⚠️
... and 15 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1307      +/-   ##
==========================================
- Coverage   80.33%   79.62%   -0.72%     
==========================================
  Files          95      103       +8     
  Lines        6602     7027     +425     
==========================================
+ Hits         5304     5595     +291     
- Misses       1298     1432     +134     

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