[Backport 2022.02.xx] #8959 Add hide options for service selector of LayerDownload plugin (#8960)

[allyoucanmap]

Description

This PR adds the cfg hideServiceSelector option for the LayerDownload plugin to hide the service selector input

Please check if the PR fulfills these requirements

• The commit message follows our guidelines: https://github.com/geosolutions-it/MapStore2/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x", remove the others)

• Minor changes to existing features

Issue

What is the current behavior?

#8959

What is the new behavior?

A new hideServiceSelector option for the LayerDownload plugin to hide the service selector field

Breaking change

Does this PR introduce a breaking change? (check one with "x", remove the other)

• No

Other useful information

[dsuren1]

@ElenaGallo Kindly test this on QA. Thanks!

[tdipisa]

@ElenaGallo Kindly test this on QA. Thanks!

Thank you so much. No need to test it in QA now since QA has been updated to 2023.01.xx. @allyoucanmap will take care of this Geonode side.