test: Drop global ignoring of two expected browser error messages

Stop ignoring them globally, and move more specific replacements into
their corresponding tests. These two are justifiable and desired.

test/common/testlib.py

@@ -1722,10 +1722,8 @@ def login_and_go(self, path: Optional[str] = None, user: Optional[str] = None, h
         # messages from our own pages
         "CPU temperature metric closed.*",
         "failed to call cockpit.Machines.Update().*",
-        "Failed to enable pmproxy in firewalld.*",
         "Getting properties for problem.*",
         "Channel for reportd D-Bus client closed.*",
-        "checkRealm failed.*",
     ]
 
     env_allow = os.environ.get("TEST_ALLOW_BROWSER_ERRORS")

test/verify/check-metrics

@@ -721,6 +721,7 @@ class TestHistoryMetrics(testlib.MachineCase):
         b.select_PF4("#firewalld-request-pmproxy", "comeandgo")
         m.execute("firewall-cmd --permanent --delete-zone comeandgo; firewall-cmd  --reload")
         b.click(".pf-v5-c-alert button.pf-m-primary")
+        self.allow_browser_errors("Failed to enable pmproxy in firewalld:.*INVALID_ZONE: comeandgo.*")
         b.wait_in_text(".pf-v5-c-alert.pf-m-warning", "Failed to enable pmproxy in firewalld")
         b.wait_in_text(".pf-v5-c-alert.pf-m-warning", "INVALID_ZONE: comeandgo")
         # close warning

test/verify/check-system-realms

@@ -1148,6 +1148,7 @@ class TestPackageInstall(packagelib.PackageCase):
 
         # case 1: disable PackageKit
         m.execute("systemctl mask packagekit; systemctl stop packagekit.service || true")
+        self.allow_browser_errors('checkRealm failed.*"problem":"not-found"')
         self.login_and_go("/system")
         b.wait_text(self.domain_sel, "Join domain")
         b.wait_visible(self.domain_sel + "[disabled]")