Postgreprovider hide raster overviews

[JanCaha]

Description

Ads option to PostGIS Connection to not list raster overview tables from Browser. The list of raster overviews tables is obtained from PostGIS view raster_overviews.

Fixes #53829

Funded by Ocean Winds

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[qgis-bot]

@JanCaha
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[rouault]

what happens if the raster_overviews table/view is not present ?

[JanCaha]

It actually worked fine, as the outcome did not have any returned rows. But the cycle to remove raster overview tables run unnecessarily, so I added a check for there being more than one raster overview in the view and also explicit check if raster_overviews exist.