530b388fc5
### Summary Self-serve billing UI is now hidden for managed-billing organizations. Plan pickers, upgrade actions, billing alerts, and related upgrade prompts are replaced with a "Contact us" option where appropriate. Uses the new showSelfServe subscription flag, defaulting to true for existing self-serve organizations. ### Testing - [x] billing pages render correctly for self-serve organizations. - [x] managed-billing organizations no longer see self-serve upgrade flows. - [x] "Contact us" actions are shown instead of upgrade actions where applicable. ### Changelog Hide self-serve billing flows for managed-billing organizations behind the new showSelfServe subscription flag.