Fix #30227

[lloc]

This PR updates the user-facing message displayed when attempting to create a user with an email address that is already pending activation in a WordPress Multisite network.

References

• Trac ticket: #30227
• Original patch: 30227.1.diff

Props @SirLouen for the copy review.

[github-actions]

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Props realloc, spacedmonkey, westonruter.

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[github-actions]

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[westonruter]

Committed in r61074.