[Fix]: fix leaderboard migrate bug
Template
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@ mention of reviewers`
@ckcollab @BrendanMyers88`
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A brief description of the purpose of the changes contained in this PR.
- add extra filed 'phase' to avoid unique_index conflict when add submission score to leaderboard
- To achieve one and only one submission score on the LeaderBoard among multiple phases, change the filter logic for “Removing any existing submissions on leaderboard” ...
Issues this PR resolves
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Known issues to be addressed in a separate PR
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A checklist for hand testing
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Any relevant files for testing
link to any relevant files (or drag and drop into github)
Misc. comments
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Checklist
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Code review by me -
Hand tested by me -
I'm proud of my work -
Code review by reviewer -
Hand tested by reviewer -
Ready to merge