Merge scrape CLI cookies through cookie jar

[OnlyYu1996]

Summary

• seed cortex scrape --cookie values into the reqwest cookie jar instead of forcing a fixed Cookie header
• allow redirect Set-Cookie values to merge with CLI-provided cookies on subsequent same-origin hops
• fix a stale test import so the affected crate tests compile on current main

Fixes PlatformNetwork/bounty-challenge#53006

Tests

• cargo fmt --package cortex-cli --check
• cargo test --package cortex-cli scrape_cmd::command::tests::test_cli_cookies_merge_with_redirect_set_cookies -- --nocapture
• cargo test --package cortex-cli scrape_cmd::tests -- --nocapture
• cargo check --package cortex-cli --lib
• git diff --check

[greptile-apps]

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