Test cases for activity definitions (#3190)
* fix:updated the availability_stats filtering lookup with date
* feat:implemented setup
* feat:added create testcases for activity definition
* feat:added update testcases
* feat:added common slug validation
* feat:added list testcases
* feat:added common slug validation
* fix:slug validation
* fix:slug validation
* fix:added some minor changes
* fix:added slug tests
* fix:add facility check in the slug validation
* refact:added changes as per the new updates
* fix:removed invalid flag usage
* revert care/emr/resources/activity_definition/spec.py
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Co-authored-by: Aakash Singh <mail@singhaakash.dev>
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