Use start and end dates as arguments for CountFormInstances script

[zuhdil]

Before the PR (what is the issue or what needed to be done)

The solution

Screenshots (if appropriate)

Reviewer Checklist

• Added an explanation about the work done
• Connected the PR and the issue on Zenhub
• Added a test plan to the issue
• Updated the copyright header (when relevant)
• Formatted the code
• Added a documentation (if relevant)
• Added some unit tests (if relevant)

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[stale]

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