build: update hardened/prod healthcheck.sh, for #6033

[stasadev]

The Issue

• #6033

I noticed that I forgot to update healthcheck.sh for production.

How This PR Solves The Issue

1. Copies the supervisorctl changes from #6033
2. Small reformatting (remove extra spaces, use printf output for variables)

Manual Testing Instructions

Automated Testing Overview

Related Issue Link(s)

Release/Deployment Notes

[github-actions[bot]]

Download the artifacts for this pull request:

• all-ddev-executables.zip
• ddev-linux-amd64.zip
• ddev-linux-arm64.zip
• ddev-macos-amd64.zip
• ddev-macos-arm64.zip
• ddev-windows-amd64-installer.zip

See Testing a PR.

• Test on Gitpod.
• Test on GitHub Codespaces.