Allow to find by invalid names

[xyzhang00]

Find finds items with matching names. While I cannot add a person with mar@ as name, I can cfind mar@, which I feel should be caught as an invalid name error

[nus-pe-bot]

Team's Response

Changed severity to very low since it does not cause an inconvenience to the user, does not affect normal operations.

Items for the Tester to Verify

:question: Issue severity

Team chose [severity.VeryLow] Originally [severity.Medium]

• [ ] I disagree

Reason for disagreement: [replace this with your explanation]

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