6404: prevent contributors from opening a PR on a main branch

[rakeshkumar1019]

#6404

Used a Git hook(pre-push) to prevent pull requests from being created from the main branch.
pre-push hook ref: https://git-scm.com/docs/git-push

[greptile-apps]

PR Summary

Introduced a pre-push Git hook to prevent contributors from pushing directly from the main branch, enforcing better branching practices.

• Added hooks/pre-push to check the current branch and exit with an error if it is 'main'.
• Updated package.json to include a postinstall script that runs scripts/setup-hooks.sh.
• Added scripts/setup-hooks.sh to automate the installation of the pre-push Git hook.

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[FelixMalfait]

Hey Rakesh, not a fan of git hooks as I feel they can be a bit annoying / we prefer to educate rather than constrain. But happy to merge the documentation change in CONTRIBUTING.md if you leave just that! Thanks a lot

[greptile-apps]

PR Summary

(updates since last review)

The pre-push Git hook and related setup scripts were removed, shifting the approach to prevent contributors from opening PRs from the main branch.

• Removed hooks/pre-push, eliminating the automated branch check.
• Deleted scripts/setup-hooks.sh, which previously installed the pre-push hook.
• Modified package.json to remove the postinstall script that executed setup-hooks.sh.

These changes indicate a move away from using Git hooks for branch management.

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[charlesBochet]

LGTM! :)