[J2 Mappings][APIM]] Add a config to authenticate with legacy method

[YasasRangika]

Purpose

Add j2 mapping changes for wso2-extensions/identity-local-auth-basicauth#260

[coderabbitai]

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[Copilot]

Pull request overview

This PR adds J2 mapping configuration support for a new legacy authentication feature in the APIM identity core. It enables conditional inclusion of the EnableLegacyAuthentication configuration element in the generated identity.xml file.

• Adds conditional J2 template logic for EnableLegacyAuthentication configuration
• Follows existing patterns for optional configuration elements in the AuthenticationPolicy section

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud