feat: [IDP-2950]: Added the steps to fetch output in IDP flows using custom action

[Debanitrkl]

Description

• Please describe your changes: Added the steps to fetch output in IDP flows using custom action
• Jira/GitHub Issue numbers (if any): ______________________________
• Preview links/images (Internal contributors only): __________________

PR lifecycle

PRs must meet these requirements to be merged:

• [x] Successful preview build.
• [x] Code owner review.
• [x] No merge conflicts.
• [x] Release notes/new features docs: Feature/version released to at least one prod environment.