Fix environment variables used during test builds (#12855)

The environment variables used for test builds was wrong for certain
bundles because the `testing` flag wasn't passed through to the
function that determines which environment variables to inject.
Effectively this means that test builds on `master` were going to the
production `metamask` Sentry project rather than the `test-metamask`
project. This has been the case since #11080.

The `testing` flag is now included for all bundles, and test builds now
use the `test-metamask` Sentry project in all cases.

development/build/scripts.js

@@ -206,18 +206,18 @@ function createScriptTasks({
     // this can run whenever
     const disableConsoleSubtask = createTask(
       `${taskPrefix}:disable-console`,
-      createTaskForBundleDisableConsole({ devMode }),
+      createTaskForBundleDisableConsole({ devMode, testing }),
     );
 
     // this can run whenever
     const installSentrySubtask = createTask(
       `${taskPrefix}:sentry`,
-      createTaskForBundleSentry({ devMode }),
+      createTaskForBundleSentry({ devMode, testing }),
     );
 
     const phishingDetectSubtask = createTask(
       `${taskPrefix}:phishing-detect`,
-      createTaskForBundlePhishingDetect({ devMode }),
+      createTaskForBundlePhishingDetect({ devMode, testing }),
     );
 
     // task for initiating browser livereload
@@ -255,7 +255,7 @@ function createScriptTasks({
     return composeParallel(initiateLiveReload, ...allSubtasks);
   }
 
-  function createTaskForBundleDisableConsole({ devMode }) {
+  function createTaskForBundleDisableConsole({ devMode, testing }) {
     const label = 'disable-console';
     return createNormalBundle({
       browserPlatforms,
@@ -271,7 +271,7 @@ function createScriptTasks({
     });
   }
 
-  function createTaskForBundleSentry({ devMode }) {
+  function createTaskForBundleSentry({ devMode, testing }) {
     const label = 'sentry-install';
     return createNormalBundle({
       browserPlatforms,
@@ -287,7 +287,7 @@ function createScriptTasks({
     });
   }
 
-  function createTaskForBundlePhishingDetect({ devMode }) {
+  function createTaskForBundlePhishingDetect({ devMode, testing }) {
     const label = 'phishing-detect';
     return createNormalBundle({
       buildType,