ci: publish develop from the production chart directory

[MusaMisto]

Draft until simplify9/.github#189 is merged. This PR uses that PR's rename-chart input. If it merges first, the develop workflow fails at startup with an unknown-input error and publishes nothing until #189 lands.

Why

Develop and production must ship the same chart. #368 did that with charts/develop: its own Chart.yaml, plus symlinks to charts/default. That left two gaps:

• charts/develop/Chart.yaml is a second file, and it can drift from production's (dependencies, kubeVersion and so on).
• charts/develop/values.yaml is a symlink, so an edit meant only for develop silently changes production's values.

What

• One chart directory. Develop builds charts/default and publishes it as bitween-develop with rename-chart: true, which sets Chart.yaml name: at package time. charts/develop is deleted, so both charts now come from one Chart.yaml, one templates/ and one values.yaml.
• Tests run in the shared pipeline. Develop sets run-tests and test-projects (refactor: move Rebex license key into BitweenOptions #189 runs them without nuget-projects), so the develop-tests job is gone. As before, a test failure does not block the deploy.
• Nothing published changes. The image is still simplify9/bitween-develop, the chart is still bitween-develop (ChartMuseum + GHCR), and the playground release is still bitween. The chart package has the same name and content as before.

[coderabbitai]

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🗂️ Base branches to auto review (8)

• ^main$
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• ^staging$
• ^development$
• ^gigstaging$
• ^develop$
• ^releases$
• ^releases/r10.0$

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