Allow differing layer projection when displaying search results from layers (option 1)

[MattiasSp]

Description
When using "option 1" of the search control config - i e when using a map layer to display feature info on search results - the projection of the named layer is not taken into account.

In the getFeature function a layer's default projection is used (no srsName parameter is specified) and it is never transformed, regardless of what projection has been specified in the layer configurations.

This becomes an issue when a layer has to use a different projection than the map projection, notably when using WFS layers from QGIS Server which only serves GeoJSON in EPSG:4326 (WGS84).

Proposed solution
If a layer's data projection differs from the map projection, transform the coordinates before returning the feature in the getFeature function.

Alternative solutions considered
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Additional context
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[MattiasSp]

Closing this as fixed by #1877 in combination with the development of projection support in QGIS Server's WFS+GeoJSON implementation in 3.30.