feat: allow hide popup if functions return false

[boeckMt]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/dlr-eoc/ukis-frontend-libraries/blob/main/CONTRIBUTING.md#-commit-message-guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• The Project is building and passes all tests without errors

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the new behavior?

• Allow return false for popup.popupFunction and popup.asyncPopup in map-ol service, to not show a popup.

This can be useful to listen on layer click or move to execute a function that does something else with the layer, but does not display a popup.

Does this PR introduce a breaking change?

• Yes
• No

Other information

Is it part of one/more packages and which?

• @dlr-eoc/services-layers:
• @dlr-eoc/map-ol:

[boeckMt]

FYI @lucas-angermann and @voinSR