feat(feature flags): info banner when a flag can't be scheduled

[jurajmajerik]

Problem

Raised by @leonposthog

Hey team - I have a question regarding role based access for Feature Flags, it looks like a user who only has "Feature Flags View" permissions, can still use the Scheduling feature of feature flags, is that expected?

Changes

Permissioning is handled at the API level, so any update attempt by a user without the edit permissions would already fail when trying to execute a scheduled flag change.

Now adding a banner to inform non-permissioned users that they need to request edit permissions before scheduling.

How did you test this code?

👀

[github-actions]

Size Change: 0 B

Total Size: 2.06 MB

ℹ️ View Unchanged

Filename	Size
frontend/dist/toolbar.js	2.06 MB

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[Phanatic]

Ship it!