PULL REQUEST RAISE WORKFLOW AUTOMATION🚀

[amiya-cyber]

Issue Description

This workflow automates messages when a PULL REQUEST is opened or raised. When a new pr is opened, it posts a welcome message to guide the submitter.

This helps improve communication and maintain consistency in pull request management.

please @Shubham-Zone add level 2 or level 3 label and assign

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[github-actions]

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