[AC-358] SelfHosted update subscription page (#5101)

* [AC-358] Add selfHostSubscriptionExpiration property to organization-subscription.response.ts

* [AC-358] Update selfHost org subscription template

- Replace "Subscription" with "SubscriptionExpiration"
- Add question mark help link
- Add helper text for grace period
- Add support for graceful fallback in case of missing grace period in subscription response

* Update libs/common/src/billing/models/response/organization-subscription.response.ts

Co-authored-by: Thomas Rittson <31796059+eliykat@users.noreply.github.com>

* [AC-358] Remove unnecessary hypen

Co-authored-by: Thomas Rittson <31796059+eliykat@users.noreply.github.com>

* [AC-358] Introduce SelfHostedOrganizationSubscription view
- Encapsulate expiration/grace period logic in the new view object.
- Remove API response getters from the angular component
- Replace the API response object with the new view

* [AC-358] Clarify name for new expiration without grace period field

* [AC-358] Update constructor parameter name

* [AC-358] Simplify new selfhost subscription view

- Make expiration date properties public
- Remove obsolete expiration date getters
- Update the component to use new properties
- Add helper to component for determining if the subscription should be rendered as expired (red text)

* [AC-358] Rename isExpired to isExpiredAndOutsideGracePeriod to be more explicit

---------

Co-authored-by: Thomas Rittson <31796059+eliykat@users.noreply.github.com>

apps/web/src/locales/en/messages.json

@@ -6553,6 +6553,18 @@
   "billingSyncHelp": {
     "message": "Billing Sync help"
   },
+  "licensePaidFeaturesHelp": {
+    "message": "License paid features help"
+  },
+  "selfHostGracePeriodHelp": {
+    "message": "After your subscription expires, you have 60 days to apply an updated license file to your organization. Grace period ends $GRACE_PERIOD_END_DATE$.",
+    "placeholders": {
+      "GRACE_PERIOD_END_DATE": {
+        "content": "$1",
+        "example": "May 12, 2024"
+      }
+    }
+  },
   "uploadLicense": {
     "message": "Upload license"
   },