chore: add presubmit and continuous kokoro tests (#5229)

* chore: add kokoro configs for running tests on PHP 7.4 and 8.0

* update PHP version for docs

* use php80 for continuous tests

* update kokoro to ues php 8 for docs gen

* update cs library and fix cs

* hopefully fix tests

* Revert "hopefully fix tests"

This reverts commit 60fe1387b5e1d22159f1cee001d4e1078dd3b448.

* fix tests for PHP 7.4

* Update docs.yml

* remove 8.0

tests/Unit/QueryResultsTest.php

@@ -36,6 +36,7 @@ class QueryResultsTest extends TestCase
     public $jobId = 'myJobId';
     public $queryData = [
         'jobComplete' => true,
+        'jobReference' => ['location' => 123],
         'rows' => [
             ['f' => [['v' => 'Alton'], ['v' => 1]]]
         ],
@@ -203,7 +204,7 @@ public function testReloadsInfo()
 
     public function testGetsIdentity()
     {
-        $queryResults = $this->getQueryResults($this->connection);
+        $queryResults = $this->getQueryResults($this->connection, $this->queryData);
 
         $this->assertEquals($this->jobId, $queryResults->identity()['jobId']);
         $this->assertEquals($this->projectId, $queryResults->identity()['projectId']);