Remove obsolete read_entry_data method from class ComponentCatalogConnector

[ptitzler]

Closes #2514

What changes were proposed in this pull request?

• Remove deprecated method
• None of the built-in component catalog connectors are impacted because they don't utilize the deprecated method
• This change breaks https://github.com/ptitzler/examples/tree/main/component-catalog-connectors/airflow-example-components-connector. The connector will not be fixed because it is no longer supported.
• This change breaks https://github.com/ptitzler/examples/tree/main/component-catalog-connectors/kfp-example-components-connector. The connector will be marked as no longer supported in Elyra v4+.
• See related changes in Update Kubeflow Pipelines and Apache Airflow example connector documentation examples#118
• TODO: fix failing server tests
• • TODO: fix failing integration tests

How was this pull request tested?

1. Installed https://github.com/ptitzler/examples/tree/main/component-catalog-connectors/kfp-example-components-connector, which only implements the obsolete method. (elyra-examples-kfp-catalog==0.1.0)
2. Created an instance of that catalog connector in Elyra.
3. Confirmed that the expected error is logged.

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[kevin-bates]

I didn't take these changes for a spin, but they look good. Thanks @ptitzler.

[shalberd]

Hello @lresende @caponetto

There is some note in the code of Elyra 4 here ... but I am unsure conceptually what Patrick wanted to achieve back then.
Has no impact on my generic node processor / Airflow generic template code modifications for Airflow 2, as far as I can see.

Just seeing this is part of the release 4.0 tracker ... just trying to understand what this code here was :-)
"example component connector" for airflow and kfp sounds unfamiliar.

[lresende]

@shalberd see more details in #2514

[caponetto]

@lresende looks like this PR has broken the CI.
https://github.com/elyra-ai/elyra/actions/runs/12544953702

[lresende]

@lresende looks like this PR has broken the CI. https://github.com/elyra-ai/elyra/actions/runs/12544953702

I have two fixes for this, one reverting the changes from #3141 in #3266 and another one with disabling the obsolete tests in #3267 . Which one should we pick @caponetto @shalberd

[shalberd]

@lresende @caponetto I'd go with the approach in PR 3267, that is: Fix CI without reverting removal of read_entry_data.
Happy New Year if we don't hear from each other in the next 24 hours :-) and thanks again y'all.

[lresende]

It looks like several tests depend on catalogs that are not working with this change, so I will have to revert it for now.