ADM-569: [Backend]Change the calculation method of Multiple Done columns

[xingxy0205]

Summary

We need to make sure the calculation method of Multiple Done columns doesn’t include the duplicate card when the card invovles multiple sprints.

Before

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After

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[github-actions]

Hi @xingxy0205! 👋
Thank you for submitting a pull request! We appreciate your contribution and will review your changes as soon as possible.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
+0.00%	∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (2c5c181)	3915	3915	100.00%
Head commit (82ca442)	3915 (+0)	3915 (+0)	100.00% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#631)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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