[MAINTENANCE] Additional tests for ValidationDefinition and Checkpoint freshness

[cdkini]

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• 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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[cdkini]

We should follow up by patching the in-memory stores to return a consistent type

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.86%. Comparing base (72e5c8f) to head (857700d).
Report is 3 commits behind head on develop.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #10381      +/-   ##
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+ Coverage    79.85%   79.86%   +0.01%     
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  Files          460      460              
  Lines        39855    39855              
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+ Hits         31825    31829       +4     
+ Misses        8030     8026       -4     

Flag	Coverage Δ
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3.10 athena or clickhouse or openpyxl or pyarrow or project or sqlite or aws_creds	?
3.10 aws_deps	?
3.10 big	?
3.10 databricks	?
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3.11	66.70% <100.00%> (+0.01%)	⬆️
3.11 athena or clickhouse or openpyxl or pyarrow or project or sqlite or aws_creds	?
3.11 aws_deps	?
3.11 big	?
3.11 databricks	?
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3.11 mysql	?
3.11 postgresql	?
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3.12	65.31% <100.00%> (+0.01%)	⬆️
3.12 aws_deps	45.92% <33.33%> (ø)
3.12 big	54.57% <33.33%> (ø)
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3.12 mysql	50.03% <33.33%> (ø)
3.12 postgresql	54.24% <33.33%> (ø)
3.12 spark	57.75% <33.33%> (ø)
3.12 trino	52.36% <33.33%> (ø)
3.8	66.74% <100.00%> (+0.03%)	⬆️
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3.9	66.72% <100.00%> (+0.01%)	⬆️
3.9 athena or clickhouse or openpyxl or pyarrow or project or sqlite or aws_creds	?
3.9 aws_deps	?
3.9 big	?
3.9 databricks	?
3.9 filesystem	?
3.9 mssql	?
3.9 mysql	?
3.9 postgresql	?
3.9 snowflake	?
3.9 trino	?
cloud	0.00% <0.00%> (ø)
docs-basic	52.40% <33.33%> (ø)
docs-creds-needed	52.70% <33.33%> (ø)
docs-spark	52.09% <33.33%> (ø)

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[billdirks]

These are great! Thanks for adding these tests.