fix WMS getMap unhandled exception

[stefanocudini]

Fix issue #12371

Description

Improvement of rendering block condition for the Openlayers WMS layer. If an exception is returned in the XML response by geoserver body, the individual image tile is blocked and removed from the queue.
the modified logic is here:
/web/client/components/map/openlayers/plugins/WMSLayer.js in custom loader: loadFunction()

A generic WMS utils has been added parseOGCException for exception parsing to display in the console in the event of specific ogc errors.

Please check if the PR fulfills these requirements

• The commit message follows our guidelines: https://github.com/geosolutions-it/MapStore2/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x", remove the others)

• Bugfix

Issue

#12371

What is the new behavior?
In the case of exceptions from the geoserver, the attempt to reload the layer is blocked in any case and the specific exception message is displayed in the console

Breaking change

Does this PR introduce a breaking change? (check one with "x", remove the other)

• Yes, and I documented them in migration notes
• No

Other useful information

For a complete reproduction of the fix, the production environment where the bug was identified is required, which requires a distribution of the layers on the geoserver via authentication and consistent configuration of the requestsConfigurationRules. See on related issues.