Make env vars more palatable for containerization (#10895)

* refactor(env-vars): remove object/colon syntax

* fix(tests): correct config expectations

test/api/v3/integration/user/auth/POST-login-local.test.js

@@ -45,7 +45,7 @@ describe('POST /user/auth/local/login', () => {
     })).to.eventually.be.rejected.and.eql({
       code: 401,
       error: 'NotAuthorized',
-      message: t('accountSuspended', { communityManagerEmail: nconf.get('EMAILS:COMMUNITY_MANAGER_EMAIL'), userId: user._id }),
+      message: t('accountSuspended', { communityManagerEmail: nconf.get('EMAILS_COMMUNITY_MANAGER_EMAIL'), userId: user._id }),
     });
   });
 

test/api/v3/integration/user/auth/PUT-user_update_email.test.js

@@ -71,7 +71,7 @@ describe('PUT /user/auth/update-email', () => {
       })).to.eventually.be.rejected.and.eql({
         code: 401,
         error: 'NotAuthorized',
-        message: t('cannotFulfillReq', { techAssistanceEmail: nconf.get('EMAILS:TECH_ASSISTANCE_EMAIL') }),
+        message: t('cannotFulfillReq', { techAssistanceEmail: nconf.get('EMAILS_TECH_ASSISTANCE_EMAIL') }),
       });
     });