feat: Allow different time units for retention policy (#32425)

.changeset/ten-stingrays-eat.md

apps/meteor/app/lib/server/methods/saveSettings.ts

apps/meteor/app/retention-policy/server/cronPruneMessages.ts

...or/client/components/InfoPanel/RetentionPolicyCallout.tsx

apps/meteor/client/lib/convertTimeUnit.spec.ts

apps/meteor/client/lib/convertTimeUnit.ts

...meteor/client/omnichannel/priorities/PriorityEditForm.tsx

apps/meteor/client/views/admin/settings/MemoizedSetting.tsx

apps/meteor/client/views/admin/settings/Setting.stories.tsx

...views/admin/settings/inputs/TimespanSettingInput.spec.tsx

...ient/views/admin/settings/inputs/TimespanSettingInput.tsx

apps/meteor/client/views/admin/settings/inputs/types.ts

...arketplace/AppDetailsPage/tabs/AppSettings/AppSetting.tsx

.../meteor/client/views/room/body/RetentionPolicyWarning.tsx

...ews/room/contextualBar/Info/EditRoomInfo/EditRoomInfo.tsx

...ntextualBar/Info/EditRoomInfo/useEditRoomInitialValues.ts

apps/meteor/client/views/room/hooks/useRetentionPolicy.ts

apps/meteor/server/settings/retention-policy.ts

apps/meteor/server/startup/migrations/xrun.ts

apps/meteor/tests/e2e/retention-policy.spec.ts