feat: add php 8.0 kokoro tests, remove php 7.2 (GoogleCloudPlatform#1269)

(recreating to refresh kokoro builds)

Author: bshaffer

.kokoro/php72.cfg .kokoro/php80.cfg.kokoro/php72.cfg renamed to .kokoro/php80.cfg

@@ -3,7 +3,7 @@
 # Configure the docker image for kokoro-trampoline.
 env_vars: {
     key: "TRAMPOLINE_IMAGE"
-    value: "gcr.io/cloud-devrel-kokoro-resources/php72"
+    value: "gcr.io/cloud-devrel-kokoro-resources/php80"
 }
 
 # Give the docker image a unique project ID and credentials per PHP version

appengine/flexible/analytics/test/DeployTest.php

@@ -29,7 +29,7 @@ public function testIndex()
         $resp = $this->client->get('/');
         $this->assertEquals('200', $resp->getStatusCode(),
             'top page status code');
-        $this->assertContains('returned 200', (string) $resp->getBody(),
+        $this->assertStringContainsString('returned 200', (string) $resp->getBody(),
             'top page content');
     }
 }

appengine/flexible/analytics/test/LocalTest.php

@@ -20,7 +20,7 @@
 
 class LocalTest extends WebTestCase
 {
-    public function setUp()
+    public function setUp(): void
     {
         parent::setUp();
         $this->client = $this->createClient();

appengine/flexible/datastore/test/DeployTest.php

@@ -30,6 +30,6 @@ public function testIndex()
         $this->assertEquals('200', $resp->getStatusCode(),
             'top page status code');
 
-        $this->assertContains("Last 10 visits:", (string) $resp->getBody());
+        $this->assertStringContainsString("Last 10 visits:", (string) $resp->getBody());
     }
 }

appengine/flexible/datastore/test/LocalTest.php

@@ -20,7 +20,7 @@
 
 class LocalTest extends WebTestCase
 {
-    public function setUp()
+    public function setUp(): void
     {
         parent::setUp();
         $this->client = $this->createClient();
@@ -43,6 +43,6 @@ public function testIndex()
         $client->request('GET', '/');
         $this->assertTrue($client->getResponse()->isOk());
         $text = $client->getResponse()->getContent();
-        $this->assertContains("Last 10 visits:", $text);
+        $this->assertStringContainsString("Last 10 visits:", $text);
     }
 }

appengine/flexible/drupal8/test/DeployTest.php

@@ -115,7 +115,7 @@ public function testContacts()
             'top page status code'
         );
         $content = $resp->getBody()->getContents();
-        $this->assertContains('Website feedback', $content);
-        $this->assertContains('Drupal', $content);
+        $this->assertStringContainsString('Website feedback', $content);
+        $this->assertStringContainsString('Drupal', $content);
     }
 }

appengine/flexible/helloworld/test/ControllersTest.php

@@ -40,7 +40,7 @@ public function testTopPage()
         $crawlerexport = $client->request('GET', '/');
         $resp = $client->getResponse();
         $this->assertTrue($resp->isOk());
-        $this->assertContains('Hello World', $resp->getContent());
+        $this->assertStringContainsString('Hello World', $resp->getContent());
     }
 
     public function testGoodbye()
@@ -49,6 +49,6 @@ public function testGoodbye()
         $crawlerexport = $client->request('GET', '/goodbye');
         $resp = $client->getResponse();
         $this->assertTrue($resp->isOk());
-        $this->assertContains('Goodbye World', $resp->getContent());
+        $this->assertStringContainsString('Goodbye World', $resp->getContent());
     }
 }

appengine/flexible/helloworld/test/DeployTest.php

@@ -32,7 +32,7 @@ public function testIndex()
         $resp = $this->client->get('/');
         $this->assertEquals('200', $resp->getStatusCode(),
             'index status code');
-        $this->assertContains('Hello World', (string) $resp->getBody(),
+        $this->assertStringContainsString('Hello World', (string) $resp->getBody(),
             'index content');
     }
 }

appengine/flexible/laravel/test/DeployDatabaseSessionTest.php

@@ -111,6 +111,6 @@ public function testHomepage()
             'top page status code'
         );
         $content = $resp->getBody()->getContents();
-        $this->assertContains('Laravel', $content);
+        $this->assertStringContainsString('Laravel', $content);
     }
 }

appengine/flexible/laravel/test/DeployTest.php

@@ -109,7 +109,7 @@ public function testHomepage()
             'top page status code'
         );
         $content = $resp->getBody()->getContents();
-        $this->assertContains('Laravel', $content);
+        $this->assertStringContainsString('Laravel', $content);
     }
 
     public function testNormalLog()