Updated The Slugify to accept username as emoji

[pranjalg13]

What does this PR do?

Added changes to accept emoji as username

• Previously it updates the emoji as (--) instead of the actual emoji
• Added a regex in which the u flag enables Unicode matching, and the g flag enables global matching (i.e., all matches are replaced, not just the first one).

Fixes #7718

Environment: Staging(main branch) / Production

Type of change

• Bug fix (non-breaking change which fixes an issue)

How should this be tested?

• [ ] Before code changes the emoji username where updated with -- value
• [ ] After this change it is updated according to the emoji provided and /avatar/emoji path is also working fine

Changes Screenshot

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[pranjalg13]

@PeerRich @zomars please review this once Thanks

[sean-brydon]

Thanks for your contribution. I'm gonna close this in favour of https://github.com/calcom/cal.com/pull/8740 as also improves functionality of our slugify function

[pranjalg13]

Cool. no issues @sean-brydon