Improve readability in legacy auth flow builder rendering logic

[pavinduLakshan]

Purpose

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Related Issues

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Related PRs

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Checklist

• e2e cypress tests locally verified.
• Manual test round performed and verified.
• UX/UI review done on the final implementation.
• Documentation provided. (Add links if there are any)
• Unit tests provided. (Add links if there are any)
• Integration tests provided. (Add links if there are any)

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[wso2-jenkins-bot]

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