Includes the VPN proxy in all builds (#3393)

Task/Issue URL: https://app.asana.com/0/1207603085593419/1208543229974056/f

Description

The VPN proxy has been embedded a long time ago into the app and recently it was enabled for the domain exclusions feature. Unfortunately for our App Store builds, the proxy was only included in DEBUG builds.

This was done because Apple usually rejects builds that include components that cannot be used, so we needed to keep it out of release builds until it was used.

During development this was missed as the DEBUG builds include the proxy.

DuckDuckGo.xcodeproj/project.pbxproj

@@ -1716,6 +1716,7 @@
 		7B7F5D242C52725A00826256 /* AddExcludedDomainButtonsView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7B7F5D232C52725A00826256 /* AddExcludedDomainButtonsView.swift */; };
 		7B7F5D252C52725A00826256 /* AddExcludedDomainButtonsView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7B7F5D232C52725A00826256 /* AddExcludedDomainButtonsView.swift */; };
 		7B8594192B5B26230007EB3E /* UDSHelper in Frameworks */ = {isa = PBXBuildFile; productRef = 7B8594182B5B26230007EB3E /* UDSHelper */; };
+		7B874BD62CBD7E8D009C6C63 /* VPNProxyExtension.appex in Embed Network Extensions */ = {isa = PBXBuildFile; fileRef = 7BDA36E52B7E037100AD5388 /* VPNProxyExtension.appex */; settings = {ATTRIBUTES = (RemoveHeadersOnCopy, ); }; };
 		7B8DB31A2B504D7500EC16DA /* VPNAppEventsHandler.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7B8DB3192B504D7500EC16DA /* VPNAppEventsHandler.swift */; };
 		7B934C412A866DD400FC8F9C /* UserDefaults+NetworkProtectionShared.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7B934C402A866DD400FC8F9C /* UserDefaults+NetworkProtectionShared.swift */; };
 		7B97CD592B7E0B57004FEF43 /* NetworkProtectionProxy in Frameworks */ = {isa = PBXBuildFile; productRef = 7B97CD582B7E0B57004FEF43 /* NetworkProtectionProxy */; };
@@ -3160,6 +3161,7 @@
 			dstPath = "";
 			dstSubfolderSpec = 13;
 			files = (
+				7B874BD62CBD7E8D009C6C63 /* VPNProxyExtension.appex in Embed Network Extensions */,
 				4BA7C4E12B3F6F8600AFE511 /* NetworkProtectionAppExtension.appex in Embed Network Extensions */,
 			);
 			name = "Embed Network Extensions";
@@ -9464,7 +9466,6 @@
 				4B2D06672A13318400DE1F49 /* Resources */,
 				4B2D067D2A13341200DE1F49 /* ShellScript */,
 				4BA7C4E02B3F6F7500AFE511 /* Embed Network Extensions */,
-				7B557F2A2B8CA2A400099746 /* Embed Debug-only Network Extensions */,
 			);
 			buildRules = (
 			);
@@ -10386,25 +10387,6 @@
 			shellPath = /bin/sh;
 			shellScript = "if [[ -z \"${SYSEX_BUNDLE_ID}\" ]]; then\n    echo \"Required build settings are not defined, please check xcconfig files\"\n    exit 1\nfi\n\n\necho \"ditto ${BUILT_PRODUCTS_DIR}/${SYSEX_BUNDLE_ID}.systemextension $BUILT_PRODUCTS_DIR/${CONTENTS_FOLDER_PATH}/Library/SystemExtensions/${SYSEX_BUNDLE_ID}.systemextension\"\n\nditto \"${BUILT_PRODUCTS_DIR}/${SYSEX_BUNDLE_ID}.systemextension\" \"$BUILT_PRODUCTS_DIR/${CONTENTS_FOLDER_PATH}/Library/SystemExtensions/${SYSEX_BUNDLE_ID}.systemextension\" || exit 1\n";
 		};
-		7B557F2A2B8CA2A400099746 /* Embed Debug-only Network Extensions */ = {
-			isa = PBXShellScriptBuildPhase;
-			alwaysOutOfDate = 1;
-			buildActionMask = 2147483647;
-			files = (
-			);
-			inputFileListPaths = (
-			);
-			inputPaths = (
-			);
-			name = "Embed Debug-only Network Extensions";
-			outputFileListPaths = (
-			);
-			outputPaths = (
-			);
-			runOnlyForDeploymentPostprocessing = 0;
-			shellPath = /bin/sh;
-			shellScript = "# Support for embedding debug-only extensions (https://stackoverflow.com/a/76948057/712306)\nfunction embedExtensions() {\n    for extension in $1\n    do\n        rsync -r --copy-links \"${CONFIGURATION_BUILD_DIR}/${extension}.appex\" \"${CONFIGURATION_BUILD_DIR}/${PLUGINS_FOLDER_PATH}\"\n    done\n}\n\ndebug_extensions=(\"VPNProxyExtension\")\n\nif [ \"${CONFIGURATION}\" != \"Release\" ]\nthen\n    embedExtensions $debug_extensions\nfi\n";
-		};
 		7BB34F502AD98394005691AE /* Copy Swift Package resources */ = {
 			isa = PBXShellScriptBuildPhase;
 			alwaysOutOfDate = 1;