feat: add option to disable redirects

[11eshaannegi]

Summary

Adds support for disabling HTTP redirects in goperf.

What’s changed

• added DisableRedirects to http client config
• updated client to not follow redirects when this is true
• passed the flag through RunConfig and CLI (--disable-redirects)
• handled it in config file + merge logic
• added some tests around this

Usage

goperf --disable-redirects

Notes

• default behavior is unchanged (redirects are followed)
• when enabled, it returns redirect responses (like 301/302) instead of following them

[rahul-infra]

Approving this PR for now.
Things to add:
Add a test in cmd/run_integration_test.go that calls NewCmd, passes --disable-redirects, and verifies behavior end-to-end.

[github-actions]

🎉 This PR is included in version 1.12.0 🎉

The release is available on GitHub release

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