INSPIRE validation - Fixing harvesting of CSW (#21870)

Harvested CSWs generate a service MD where:
* service type is wrong (OGC:CSW instead of discovery)
* A keyword is missing (from inspire-service-taxonomy)
Harvesting OGC WMS services - INSPIRE compat. (#21870)

Need to add the inspire_ds / inspire_vs XML prefix. Adding a wildcard
prefix in the Xpath.
Merge pull request #647 from pmauduit/fix-inspire-harvesting

Fix inspire harvesting