Harden the Google Analytics account fetch

Three defects, all found reviewing the rebased branch.

The connection probe hit /v1alpha/accounts, which any analytics.readonly
grant can call, while the driver's first request is the account's
accessBindings — that additionally needs Administrator on the account
and the manage.users.readonly scope. An Editor connecting, or a user
declining the second scope on Google's granular consent screen, probed
green and then 403'd on every campaign fetch, leaving the source
permanently "Connected" with no rows. The probe now targets the same
accessBindings collection the driver reads.

A single unreadable property aborted the whole account. A property the
token cannot see, or one deleted between the list and the read, threw
away every binding already collected; 49 of 50 readable properties are
still worth reviewing, so 403 and 404 now skip that property. Anything
else still fails the fetch.

Fan-out errors named no resource: the account call, the property list
and each per-property call all returned the same "unexpected status"
string, so a 403 on one subproperty out of forty was unattributable.
Errors now carry the account or property ID.

The cassette gains a subproperty parented to another property (only
reachable through the ancestor filter, so it pins the hierarchy walk
that the filter change claimed) and a property returning 403.

Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>

pkg/accessreview/drivers/google_analytics_test.go

@@ -38,7 +38,7 @@ func TestGoogleAnalyticsDriver(t *testing.T) {
 	driver := NewGoogleAnalyticsDriver(client, "123456")
 	records, err := driver.ListAccounts(context.Background())
 	require.NoError(t, err)
-	require.Len(t, records, 3)
+	require.Len(t, records, 4)
 
 	// alice holds an account-level admin binding AND a property-level viewer
 	// binding: roles are merged, deduplicated, sorted, prefix-stripped, and the
@@ -62,4 +62,14 @@ func TestGoogleAnalyticsDriver(t *testing.T) {
 	assert.Equal(t, "carol@example.com", carol.Email)
 	assert.False(t, carol.IsAdmin)
 	assert.Equal(t, []string{"analyst"}, carol.Roles)
+
+	// dave holds a binding only on properties/99999, a subproperty parented to
+	// another property rather than to the account. He is reachable only through
+	// the ancestor filter, so his presence is what proves subproperties are
+	// walked. A third property (55555) returns 403 and is skipped rather than
+	// failing the whole account — otherwise these four records would be zero.
+	dave := records[3]
+	assert.Equal(t, "dave@example.com", dave.Email)
+	assert.False(t, dave.IsAdmin)
+	assert.Equal(t, []string{"analyst"}, dave.Roles)
 }