Fix: Add disable_email_domain_validation config for email login [4.0.0]

[wso2-engineering-bot]

This PR was automatically generated by Claude AI.

• Issue: missing configs in the doc for setup an e-mail login configurations #10619
• Type: Documentation / Suggestions
• Summary: Added the missing disable_email_domain_validation configuration to the email login setup documentation and config catalog. This configuration is required along with enable_email_domain to allow both username and email-username to work together.
• Style Scope Verification: Microsoft Style Guidelines have been applied ONLY to newly added content without modifying existing content style unless specifically requested.
• Verification: Documentation changes have been verified and committed successfully.

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