Fix test isolation by ensuring plugin is activated before configuring settings

The `test_adds_script_with_ignored_pages` test assumed the plugin was already
active from a previous test, but PHPUnit tests run in isolation and execution
order isn't guaranteed.

- Add `activatePluginIfNeeded()` helper to BrowserTestCase that conditionally
  activates the plugin only if not already active
- Update `test_adds_script_with_ignored_pages` to use the helper

This ensures the test works regardless of execution order or whether the plugin
is already activated.

Author: adriaandotcom

tests/Browser/BrowserTestCase.php

@@ -45,4 +45,17 @@ protected function asEditor()
     {
         return $this->asUser('editor', 'editor');
     }
+
+    protected function activatePluginIfNeeded(PantherBrowser $browser): PantherBrowser
+    {
+        $browser->visit('/wp-admin/plugins.php');
+
+        $activateButton = $browser->crawler()->filter('#activate-simpleanalytics');
+
+        if ($activateButton->count() > 0) {
+            $browser->click('#activate-simpleanalytics');
+        }
+
+        return $browser;
+    }
 }

tests/Browser/PluginSettingsTest.php

@@ -20,10 +20,10 @@ public function test_activation_and_presence_of_default_scripts(): void
 
     public function test_adds_script_with_ignored_pages(): void
     {
-        $this->asAdmin()
-            ->visit('/wp-admin/plugins.php')
-            ->click('#activate-simpleanalytics')
-            ->visit('/wp-admin/options-general.php?page=simpleanalytics&tab=ignore-rules')
+        $browser = $this->asAdmin();
+        $this->activatePluginIfNeeded($browser);
+
+        $browser->visit('/wp-admin/options-general.php?page=simpleanalytics&tab=ignore-rules')
             ->fillField('simpleanalytics_ignore_pages', '/vouchers')
             ->click('Save Changes')
             ->visit('/wp-admin/options-general.php?page=simpleanalytics&tab=ignore-rules')