[AAE-9200] - Be able to customise task/process list and header date f… (#7711)

* [AAE-9200] - Be able to customise task/process list and header date formats

* Update json schema

* Revert schema changes

* Update task and process name translation values

* move task/process header date formats inside header config

* Add documentation

* Update documentation

* Use a fixed timezone for unit tests of core and cloud

* Fix e2e due to column rename

* More e2e fixes due to column rename, remove test covered by unit test

lib/core/karma.conf.js

@@ -102,4 +102,5 @@ module.exports = function (config) {
         browsers: ['Chrome'],
         singleRun: false
     });
+    process.env.TZ = 'UTC';
 };