Better distinguish Arcgis feature/map icons in the browser

[olivierdalang]

Description

This is a partial revival of #58454 which aims to improve how Arcgis REST services appear in the browser, to distinguish a bit better between map services and feature services. Instead of the initial approach in #58454 (which added the type as text in the label), this uses two icons variants. It doesn't change the tooltip, as the tooltip shows the URL which already contains this information (last part of the URL).

While at it, this PR also improves (I think) the icons for Arcgis REST services by putting the esri logo in bigger (the icons are so small, it was barely recognizable). I can revert that if you think it's not worth the change (in regards to user docs or trademark issues even if the logo was in there already).

Let's hope we can get this merged, as it's one small commit for QGIS, but one giant leap into opensource geospatial for yet another swiss administration :-D

Icons

	before	after	(wms/wfs icon for reference)
arcgis rest server
arcgis map server*
arcgis feature service
arcgis map service

*: defined in QgsAmsProvider.cpp, but couldn't find it used anywhere ?

Screenshot

before	after

[github-actions]

🪟 Windows builds

Download Windows builds of this PR for testing.
Debug symbols for this build are available here.
(Built from commit d0c5256)

🪟 Windows Qt6 builds

Download Windows Qt6 builds of this PR for testing.
(Built from commit d0c5256)

[github-actions]

The QGIS project highly values your contribution and would love to see this work merged! Unfortunately this PR has not had any activity in the last 14 days and is being automatically marked as "stale". If you think this pull request should be merged, please check

• that all unit tests are passing

• that all comments by reviewers have been addressed

• that there is enough information for reviewers, in particular

  • link to any issues which this pull request fixes

  • add a description of workflows which this pull request fixes

  • add screenshots if applicable

• that you have written unit tests where possible
  In case you should have any uncertainty, please leave a comment and we will be happy to help you proceed with this pull request.
  If there is no further activity on this pull request, it will be closed in a week.