fix: resolve issue #1378 - Alphanumeric Regex Format Validation for Leetcode Usernames

[sonusharma6-dsa]

Closes #1378

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Reviewing files that changed from the base of the PR and between e15a36c and 42e989a.

📒 Files selected for processing (2)

• server/src/module/ats/__tests__/ats.service.test.ts
• server/src/module/leetcode/leetcode.validation.ts

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