added /{lei}/filings/{period_code} endpoint and pytest

[nargis-sultani]

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• Code can be automatically merged (no conflicts)
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Testing checklist

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• Chrome
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• Edge
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• Keyboard friendly
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• Is useable without CSS
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• No linting errors or warnings
• JavaScript tests are passing

[github-actions]

Coverage report

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File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
src/sbl_filing_api/entities/repos
submission_repo.py
src/sbl_filing_api/routers
filing.py					55
Project Total

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[jcadam14]

This story is actually meant for the backend to look into the access token, get all the LEIs from it, and then get the existing filings for that lei and period. Plus, this is a POST-MVP requirement because we still have to discuss the flow if a filing doesn't exist, what happens. So for now I think we need to reject this (we won't be using Tasks also, so the call to populate_missiing_tasks is not need for MVP), focus on finishing #141 because that's actually causing issues with the frontend flow if someone uploads a poorly formatted CSV