Fixes

• Hover effects in sidecar have low contrast #8020
• Low contrast in monaco editor folding overlay #8023
• Bump xterm.js to pick up performance fixes #8024
• rm -rf for s3 buckets may fail due to incomplete multi-part uploads #8027

Warnings about macOS Signed Builds

The advantage of these builds is Apple has vetted them, and you thus avoid the security warning when launching Kui. However, due to underlying Electron/nodejs bugs, they can be quite laggy, though still usable. See the discussion here. Hopefully the underlying bugs will be fixed soon, so we can mainstream the signed builds.