Remove support for the `read_catalog_entry` method for component catalog connectors

[kiersten-stokes]

Is your feature request related to a problem? Please describe.
As of #2492, a new method, get_entry_data, was added to the ComponentCatalogConnector class. This method replaces the old read_catalog_entry method and returns a well-defined EntryData object rather than a simple string definition. The deprecated method and the related fallback code in read_component_definitions that maintains backwards compatibility should be removed in the next major release (and no earlier).

[Hema-Mathiyazhagan]

@ptitzler I am interested in working for this issue. could you please assign this to me?