cesium/3d mode forces wms requests to version 1.1.1

[landryb]

Description

as found out by @jeanpommier, switching to cesium/3d mode forces the use of WMS version 1.1.1, while some services don't support that version. Such an important service is the french national raster service at https://data.geopf.fr/wms-r/wms which rejects WMS 1.1.1 with a 400 code and a service exception:

<ServiceExceptionReport xmlns="http://www.opengis.net/ogc">
<ServiceException code="InvalidParameterValue" >
  Valeur du parametre VERSION invalide (1.3.0 disponible seulement))
</ServiceException>
</ServiceExceptionReport>

i've quickly looked at the ms2 code and haven't found where the switch was done, https://github.com/geosolutions-it/MapStore2/blame/master/web/client/utils/cesium/WMSUtils.js#L153 seems to be for singletile mode but thats wms 1.1.0.

it's confusing for the user, since a layer that works in 2d mode disappears in 3d mode.

How to reproduce

• load any WMS layer from https://data.geopf.fr/wms-r/wms in 2d mode -> the layer is displayed and the requests default to 1.3.0
• switch to 3d mode

Expected Result

the WMS layer should be displayed
Current Result

network console fills with 400 codes because WMS 1.1.1 isnt supported, and the layer isnt displayed

• Not browser related

Browser info

(use this site: https://www.whatsmybrowser.org/ for non expert users)

Browser Affected	Version
Internet Explorer
Edge
Chrome
Firefox
Safari

Other useful information

this might be loosely linked to #8599, since iirc the styles/style parameter was one of the differences between wms 1.1 and 1.3