And transparently map requests for grass7 provider to grass provider
It's misleading putting an old version number in the provider name,
when this provider supports grass versions 8 +
Use the safer method of explicitly including the provider type
when storing layer sources to string in more places, which eg
fixes running the copied qgis_process string when a non gdal
layer source is used for a raster layer. Also fixes the same
situation when restoring an algorithm from the history log.
Fixes#54264
And make sipify handle this nicely. This means that all our non-flag
style enums correctly map across to IntFlag python enums on Qt 6,
fixing issues with negative enum values for these and providing
a better match for the original c++ enum.
