Fix stale app UI (supabase) & overall E2E test infra improvements (#337)

Fixes #269

e2e-tests/snapshots/supabase_stale_ui.spec.ts_supabase---stale-ui-1.aria.yml

@@ -0,0 +1,6 @@
+- paragraph: tc=add-supabase
+- paragraph: Adding supabase...
+- text: Integrate with supabase?
+- button "Set up supabase"
+- button "Retry":
+  - img

e2e-tests/snapshots/supabase_stale_ui.spec.ts_supabase---stale-ui-2.aria.yml

@@ -0,0 +1,8 @@
+- paragraph: tc=add-supabase
+- paragraph: Adding supabase...
+- img
+- text: Supabase integration complete
+- paragraph: "This app is connected to Supabase project: Fake Supabase Project"
+- paragraph: Click the chat suggestion "Keep going" to continue.
+- button "Retry":
+  - img

e2e-tests/snapshots/supabase_stale_ui.spec.ts_supabase---stale-ui-3.aria.yml

@@ -0,0 +1,6 @@
+- paragraph: tc=add-supabase
+- paragraph: Adding supabase...
+- text: Integrate with supabase?
+- button "Set up supabase"
+- button "Retry":
+  - img