feat: Support --exclusive-start-key option for ensure_identity_traits_blanks

[khvn26]

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Changes

Added an option to retrieve the exclusive start key for the heal identities command from Sentry in case if an exception raised during command runtime. We also allow to start the scanning from an exclusive start key by providing a command argument. Additionally, there's a bit of a refactoring to clearly segregate table scans and table queries.

How did you test this code?

Added unit tests to cover new code.

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)	Visit Preview		Jan 2, 2025 10:48am
flagsmith-frontend-preview	⬜️ Ignored (Inspect)	Visit Preview		Jan 2, 2025 10:48am
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[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api:pr-4941	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4941	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4941	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-e2e:pr-4941	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-4941	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-4941	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-4941	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-4941	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-4941	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4941	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4941	Finished ✅	Results ✅

[github-actions]

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