F fix linkify preview

Summary

For https://gitlab.indiscale.com/caosdb/customers/leibniz-zmt/management/-/issues/182. Fixes a bug in linkify whereby an additional URL would be appended for every time a preview of a referenced entity was loaded.

Focus

Simply introduced a new css class caosdb-v-property-linkified to denote the properties that have been linkified already.

Test Environment

Manual testing only, since the bug requires the firing of the previewReadyEvent to occur.

Follow the steps to reproduce https://gitlab.com/caosdb/caosdb-webui/-/issues/199 and verify that the bug doesn't occur anymore. Also add an URL to the referenced entity. Feel free to play around with more than one referenced entity, more than one URL property, list of URLs, editting, and whatever else you can come up with.

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