Allow for a wider layer list panel in Cesium Maps to accomodate long layer names

[robyngit]

With the release of v 2.28.0, we will keep every layer in one line and use ellipsis if the layer name is too long. To make layer names more legible, we will widen the toolbar panel and layer details view so we can accommodate longer layer names.

Then we face a challenge in the main repository maps that use a 3-part view, where the map view doesn't have enough space for the wide panel. Given that it's a setup only existing in main repositories (for now), we'll apply the wide panel only in portal maps.

Before:

After:

3-part map view in ADC:

Originally a subtask of #2277, more discussion on this issue can be found there.