chore: Add more CrossmintAuth tests, add isEmailValid tests

[wsdt]

Changelog

[X] No dependencies added
[X] No changes to code or existing tests

Unit tests

• Added more unit tests to packages/common/auth/CrossmintAuth.test.ts
• Added isEmailValid tests in packages/common/auth/utils/isEmailValid.test.ts
• No changes to existing tests

Would love some feedback on this!

Personally have used CrossMint on couple of projects and love what you do.

Hope you find this helpful!

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