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[wcs] safer and faster rendering of WCS layers
Redering of WCS layers has been quite inefficient since introduction of multi-threaded rendering in QGIS 2.4: whenever map rendering was starting, copying of WCS provider involved running full initialization of WCS provider which typically does three(!) network requests in the constructor (get capabilities + 2x check to work around some incompatibilities of WCS servers). This was both slow and potentially dangerous because of embedded QEventLoop for the network requests. This is now gone and when WCS provider gets cloned (e.g. when starting map rendering), it just gets copy of data without any extra work. Avoiding embedded QEventLoop fixes a crash in 3D view when loading tiles. Fixes #28800 Fixes #26706
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