sentry: Disable Sentry for now on Android

This is a workaround for zulip#5757, the crashes we've started to
regularly see as many users' devices have started taking the
Google Play system update dated 2023-08.

See the (long) chat thread here:
  https://chat.zulip.org/#narrow/stream/48-mobile/topic/Android.20crashes/near/1640893

and issue threads reported in Android's and Sentry's trackers:
  https://issuetracker.google.com/issues/300840851
  https://github.com/getsentry/sentry-unity/issues/1444

docs/changelog.md

@@ -39,6 +39,17 @@ It doesn't include
 
 ## Unreleased
 
+### Highlights for users
+
+* (Android) Disabled Sentry error reporting, which was causing
+  crashes following a recent Android update. (#5757)
+
+
+### Highlights for developers
+
+* Disabled Sentry on Android, as a workaround for the newly-frequent
+  crash bug #5757.
+
 
 ## 27.211 (2023-08-31)
 

docs/howto/release.md

@@ -102,12 +102,9 @@ simple terminology for the process we follow with both.
   tools/checkout-keystore
   ```
 
-* Apply the Sentry client key (using the local branch created for this
-  in initial setup):
-
-  ```
-  git rebase @ release-secrets
-  ```
+* Do *not* apply the Sentry client key from the `release-secrets`
+  branch; if you're already on that branch (from e.g. making the iOS
+  build), move off of it.  See our issue #5757.
 
 * Build the app, as both good old-fashioned APKs and a fancy new AAB:
 

tools/android

@@ -64,14 +64,16 @@ do_apk() {
     check_yarn_link
     run_visibly yarn
 
-    run_visibly tools/gradle :app:assembleRelease -Psigned -Psentry
+    # TODO: start passing -Psentry again
+    run_visibly tools/gradle :app:assembleRelease -Psigned
 }
 
 do_aab() {
     check_yarn_link
     run_visibly yarn
 
-    run_visibly tools/gradle :app:bundleRelease -Psigned -Psentry
+    # TODO: start passing -Psentry again
+    run_visibly tools/gradle :app:bundleRelease -Psigned
 }
 
 case "${action}" in