Adds a "Choose a release template" suggestion for production
environments without strategies (enterprise only).
When clicked, opens the "Add Strategy" dialog with the release templates
filter preselected.
Non-production environments continue to show the default strategy
suggestion.
## Notes
This unfortunately turned out to be a big PR 🥲 as it includes some
refactoring to be able to reuse components.
- The "Add strategy" button has been broken out of
`FeatureStrategyMenu`, so the latter can be reused (since we want to
show the same dialog when clicking the button "Choose a release
template");
- The new `EnvironmentTemplateSuggestion` shares styles with
`EnvironmentStrategySuggestion` (which can be found in
`EnvironmentHeader.styles.tsx`);
- `FeatureStrategyMenu` now has a `defaultFilter` prop, so the dialog
can be opened with a preselected filter.
<img width="900" height="349" alt="Screenshot 2026-02-03 at 17 19 32
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src="https://github.com/user-attachments/assets/27f11e24-163f-4f4d-8134-a5d08ff540ac"
/>
<img width="1379001" height="557" alt="Screenshot 2026-02-03 at 17 20
14"
src="https://github.com/user-attachments/assets/0efe77f5-af3e-498a-b305-fd5c1ed98906"
/>
