fix(plugin): emit debug logs for plugin remove in verbose mode

[694410194]

Summary

• add debug logging before plugin removal so cortex --verbose plugin remove ... prints diagnostic context
• log when the removal is aborted at the confirmation prompt
• log successful directory removal while keeping the user-facing success line unchanged

Verification

• git diff --check
• static check that main.rs maps --verbose to LogLevel::Debug
• static check that run_remove now emits tracing::debug! messages before, during, and after removal
• rustc --version (not available in this environment, so cargo-based checks could not be run here)

Fixes #53152
/claim #53152

[greptile-apps]

Your free trial has ended. If you'd like to continue receiving code reviews, you can add a payment method here.