feat!: bump Gradle 7.6 & AGP 7.4.2 (#1539)

* feat: bump gradle 7.6
* feat: bump android gradle plugin 7.3.1
* feat: bump android gradle plugin 7.4.2
* fix!: move android package name to build.gradle namespace
* fix!: remove deprecated package name from AndroidManifest
* fix: package name
* fix: rename CordovaGradleConfigParser's _save to write
* test: fix CordovaGradleConfigParser related specs
* fix: test refactoring for gradle namespace
* fix: accidental variable naming mixing

---------

Co-authored-by: Norman Breau <norman@nbsolutions.ca>

lib/builders/ProjectBuilder.js

@@ -27,6 +27,7 @@ const check_reqs = require('../check_reqs');
 const PackageType = require('../PackageType');
 const { compareByAll } = require('../utils');
 const { createEditor } = require('properties-parser');
+const CordovaGradleConfigParserFactory = require('../config/CordovaGradleConfigParserFactory');
 
 const MARKER = 'YOUR CHANGES WILL BE ERASED!';
 const SIGNING_PROPERTIES = '-signing.properties';
@@ -145,19 +146,6 @@ class ProjectBuilder {
         };
     }
 
-    extractRealProjectNameFromManifest () {
-        const manifestPath = path.join(this.root, 'app', 'src', 'main', 'AndroidManifest.xml');
-        const manifestData = fs.readFileSync(manifestPath, 'utf8');
-        const m = /<manifest[\s\S]*?package\s*=\s*"(.*?)"/i.exec(manifestData);
-        if (!m) {
-            throw new CordovaError('Could not find package name in ' + manifestPath);
-        }
-
-        const packageName = m[1];
-        const lastDotIndex = packageName.lastIndexOf('.');
-        return packageName.substring(lastDotIndex + 1);
-    }
-
     // Makes the project buildable, minus the gradle wrapper.
     prepBuildFiles () {
         // Update the version of build.gradle in each dependent library.
@@ -184,7 +172,11 @@ class ProjectBuilder {
                 checkAndCopy(subProjects[i], this.root);
             }
         }
-        const projectName = this.extractRealProjectNameFromManifest();
+
+        // get project name cdv-gradle-config.
+        const cdvGradleConfig = CordovaGradleConfigParserFactory.create(this.root);
+        const projectName = cdvGradleConfig.getProjectNameFromPackageName();
+
         // Remove the proj.id/name- prefix from projects: https://issues.apache.org/jira/browse/CB-9149
         const settingsGradlePaths = subProjects.map(function (p) {
             const realDir = p.replace(/[/\\]/g, ':');