Remove pricing amounts from tier displays in dashboard

[simonhamp]

Summary

• Removed subscriber/start price from the pricing tier radio buttons in the draft plugin edit form, showing only the regular price
• Removed price numbers entirely from the Type summary pills and text across pending, approved, and rejected plugin views — now shows just the tier name (e.g. "Bronze" instead of "Bronze — $29")

Test plan

• Existing plugin dashboard tests pass (PluginStatusTransitionsTest, PluginPaidOnboardingTest, PluginCreateTest)
• Verify pricing tier radio buttons show only the regular price (e.g. "$29" not "$11 – $29")
• Verify Type summary pills show only tier label (e.g. "Bronze") without price
• Check all plugin states: draft, pending, approved, rejected

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