ci: change event to pull_request_target

[Shurtu-gal]

Description

• Related to ci: checkout of PR branch is not working #1025
• Changes event to pull_request_target for access to secrets

Caution

As the event is being changed to pull_request_target we need to ensure no security vulnerability.

PS:- Can a comment be added with a mention of this?

Note

This PR should not be merged till the automation workflow is set as it will close the current TSC PRs as seen here

Related issue(s)
Fixes #1024

[Shurtu-gal]

/dnm

As this currently depends on correct workflow setup.

[github-actions]

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