feat(#11302): publish helm charts

[mrjones-plip]

Description

This PR does four things:

• it adds prepackaged helm charts for older CHT version 5.0.0 through 5.2.0
• adds instructions on how to add a new helm chart when you're doing release manager stuff
• gives a script for release manager to easily generate the new package
• runs CI on a new release to push the contents of the new helm-releases directory to docs site. This will be docs.communityhealthtoolkit.org/cht-core which is kinda janky, but its the way GH Pages works 🤷

Closes #11302

Code review checklist

• UI/UX backwards compatible: Test it works for the new design (enabled by default). And test it works in the old design, enable can_view_old_navigation permission to see the old design. Test it has appropriate design for RTL languages.
• Readable: Concise, well named, follows the style guide
• Documented: Configuration and user documentation on cht-docs
• Tested: Unit and/or e2e where appropriate
• Internationalised: All user facing text
• Backwards compatible: Works with existing data and configuration or includes a migration. Any breaking changes documented in the release notes.
• AI disclosure: Please disclose use of AI per the guidelines.

Compose URLs

If Build CI hasn't passed, these may 404:

• Core
• CouchDB Single
• CouchDB Cluster

License

The software is provided under AGPL-3.0. Contributions to this project are accepted under the same license.