docs: recommend suiup over brew/cargo install and add --features tracing (#27354)

## Summary
- Marks suiup as "(recommended)" in the quick-install tab selector used
across onboarding pages
- Adds info callouts to the Homebrew and Chocolatey tabs explaining that
suiup is the recommended installer and supports version pinning +
additional Sui stack components
- Updates the `info-easy-install` snippet (used by install-from-source
and install-from-binaries pages) to name suiup explicitly
- Adds `--features tracing` to the `cargo build --profile release`
command in install-binaries
- Adds a suiup migration suggestion to the "Upgrade from Cargo" section
- Updates the tooling page's Sui CLI card notes to lead with suiup as
recommended
- Updates the style guide formatting example from `brew install sui` to
`suiup install sui@testnet`

## Test plan
- [ ] Verify the quick-install tabs render correctly with
"(recommended)" label
- [ ] Check that the info callouts appear in the Homebrew and Chocolatey
tabs
- [ ] Confirm install-binaries and install-source pages show the updated
`info-easy-install` snippet
- [ ] Verify the tooling page card renders with updated notes

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>