Bug 1771292 - set webmessaging/broadcastchannel/cross-partition.https.tentative.html as failing outside Nightly.

New test steps got added in bug 1770342.

First party isolation (partioning) is only enabled in Nightly. Bug 1549587 is
the general bug tracking first party isolation.

Differential Revision: https://phabricator.services.mozilla.com/D147493

testing/web-platform/meta/webmessaging/broadcastchannel/cross-partition.https.tentative.html.ini

@@ -1,5 +1,6 @@
 [cross-partition.https.tentative.html]
   expected:
+    if release_or_beta: OK
     if (os == "linux") and not debug and fission: [OK, TIMEOUT]
     if (os == "linux") and not debug and not fission: [OK, TIMEOUT]
     if (os == "win") and not debug: [OK, TIMEOUT]
@@ -10,16 +11,19 @@
 
   [BroadcastChannel messages aren't received from a nested iframe with a cross-site ancestor]
     expected:
+      if release_or_beta: FAIL
       if os == "android": FAIL
 
   [BroadcastChannel messages aren't received from a cross-partition dedicated worker]
     expected:
+      if release_or_beta: FAIL
       if (os == "linux") and not debug: [PASS, TIMEOUT]
       if (os == "mac") and not debug: [PASS, TIMEOUT]
       if os == "android": FAIL
 
   [BroadcastChannel messages aren't received from a cross-partition shared worker]
     expected:
+      if release_or_beta: FAIL
       if (os == "linux") and not debug and fission: [PASS, TIMEOUT, NOTRUN]
       if (os == "linux") and not debug and not fission: [PASS, NOTRUN]
       if (os == "win") and not debug and (processor == "x86"): [PASS, TIMEOUT]
@@ -28,6 +32,7 @@
 
   [BroadcastChannel messages aren't received from a cross-partition service worker]
     expected:
+      if release_or_beta: FAIL
       if (os == "win") and not debug and (processor == "x86"): [PASS, TIMEOUT, NOTRUN]
       if (os == "linux") and not debug and not fission: [PASS, NOTRUN]
       if (os == "linux") and not debug and fission: [PASS, TIMEOUT, NOTRUN]