[MAINTENANCE] Improve error message around instantiating and saving s…

[tyler-hoffman]

…uites

Main stuff

• Updates the error around saving a non-added suite to resolve https://greatexpectations.atlassian.net/browse/V1-240.
• Scope creep alert: also adds a test around, and cleans up, the exception that is raised when instantiating a suite with no context.

Other stuff

• Updates set_context to allow None values. I think this is desirable to test specific cases like this, and it's not part of the public api, so it should only be used internally.
• There's a comment above the updated Exception about how we are clobbering errors from the store. I considered changing the logic so that we check in the suite if it has been persisted and raise there, but that introduces a race condition, and I think we mostly need to solve for the normal use case.

• Description of PR changes above includes a link to an existing GitHub issue
• PR title is prefixed with one of: [BUGFIX], [FEATURE], [DOCS], [MAINTENANCE], [CONTRIB]
• Code is linted - run invoke lint (uses ruff format + ruff check)
• Appropriate tests and docs have been updated

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.28%. Comparing base (77fc8e9) to head (71f606b).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #9908      +/-   ##
===========================================
+ Coverage    77.27%   77.28%   +0.01%     
===========================================
  Files          492      492              
  Lines        41999    42006       +7     
===========================================
+ Hits         32455    32465      +10     
+ Misses        9544     9541       -3     

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3.8 mssql	48.72% <54.54%> (+<0.01%)	⬆️
3.8 mysql	48.78% <54.54%> (+<0.01%)	⬆️
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3.8 trino	50.72% <54.54%> (+<0.01%)	⬆️
3.9	63.75% <100.00%> (+0.01%)	⬆️
cloud	0.00% <0.00%> (ø)
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[billdirks]

LGTM