feat: Adds plus indicator when is_num_identity_overrides_complete is false

[tiagoapolo]

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Changes

Adds plus indicator when is_num_identity_overrides_complete is false implemented in #4840

ref: #4931

How did you test this code?

Mannualy

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Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-4938	Finished ✅	Skipped
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[github-actions]

Uffizzi Ephemeral Environment deployment-59309

☁️ https://app.uffizzi.com/github.com/Flagsmith/flagsmith/pull/4938

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[matthewelwell]

Looks good to me, but we'll probably want to test it once #4840 is merged.