DDL should inform that the timezone at the export process is GMT

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.X, 7.1.X, 7.2.X, Master
• Fix Version/s: 7.0.0 DXP FP86, 7.0.10.12 DXP SP12, 7.0.X, 7.1.10 DXP FP14, 7.1.X, 7.2.10 DXP FP2, 7.2.10.1 DXP SP1, 7.2.1 CE GA2, 7.2.X, 7.3.10 DXP GA1, Master
• Component/s: Dynamic Data Lists
• Labels:
  • ee-ts
  • liferay-dxp-70-sp12
  • liferay-dxp-72-sp1
  • liferay-fixpack-de-86-7010
  • liferay-fixpack-dxp-14-7110
  • liferay-fixpack-dxp-2-7210
• Branch Version/s:
  7.2.x, 7.1.x, 7.0.x
• Backported to Branch:
  Committed
• Fix Priority: 3
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/76976

The csv file created in the Dynamic Data Lists export procces register the time with GMT timezone.

It doesn't take into account the portal or user timezone configuration, so it should inform the actual timezone with an advise.

Reproduction steps:
1, Set Portal Instance's timezone different to GMT
2, Set User's timezone different to GMT
3, Create a dynamic data list with an entry (by creating a dynamic data list with a date field, then submitting 1 entry)
4, Export the entries to CSV
5, Open with editor or Excel

Actual result: the timezone is actually in GMT

Expected result: The portal should inform that the timezone used at the exportation process will be GMT regardless of which timezone is configured on the instance.