fix: Override error on filterwarnings to pass notebook tests

[matthewfeickert]

Description

To get the notebook tests to pass given the many warnings that pop up from the Jupyter infrastructure and papermill, override the ini option for filterwarnings (added in PR #1773) with an empty list to disable error on filterwarnings as the notebook tests are testing for notebooks to run with the latest API, not if Jupyter infrastructure is warning free.

The use of PYTHONWARNINGS='default' should be possible, but is causing errors and is now Issue #1840.

Use scrapbook as it is the new name of nteract-scrapbook and nteract-scrapbook is no longer maintained or developed.
Restrict papermill and scrapbook to compatible releases at the patch level for API stability.

Use the papermill.execute_notebook cwd optional argument to change the execution directory safely to avoid having the state of operations change in the test.

Add concurrency group to avoid wasting run time.

Resolves #1725

Checklist Before Requesting Reviewer

• Tests are passing
• "WIP" removed from the title of the pull request
• Selected an Assignee for the PR to be responsible for the log summary

Before Merging

For the PR Assignees:

• Summarize commit messages into a comprehensive review of the PR

* Use 'scrapbook' as it is the new name of 'nteract-scrapbook', which is no longer
maintained or developed.
* Restrict 'papermill' and 'scrapbook' to compatible releases at the patch level
for API stability.
* Override error on filterwarnings for the 'notebooks' GHA workflow as it is testing
for the notebooks to run with the latest pyhf API, not if the Jupyter infrastructure
is warning free.
* Use the papermill.execute_notebook 'cwd' optional argument to change the execution
directory safely.
* Use a concurrency group to limit the notebook testing workflow to only one run
at a time.
   - c.f. https://docs.github.com/en/actions/using-jobs/using-concurrency

[codecov]

Codecov Report

Merging #1841 (d46bc21) into master (e8cb581) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1841   +/-   ##
=======================================
  Coverage   98.16%   98.16%           
=======================================
  Files          68       68           
  Lines        4315     4315           
  Branches      725      725           
=======================================
  Hits         4236     4236           
  Misses         46       46           
  Partials       33       33           

Flag	Coverage Δ
contrib	26.44% <ø> (ø)
doctest	60.78% <ø> (ø)
unittests-3.10	96.03% <ø> (ø)
unittests-3.7	96.02% <ø> (ø)

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[matthewfeickert]

And notebooks pass now 👍