Should we remove "hexhas" from the input_data in tests?

[sven-oly]

e.g., in https://unicode-org.github.io/conformance/cpp/icu78/lang_names/verifier_test_report.html

{"label":"0000","language_label":"en-MM","locale_label":"en","languageDisplay":"standard","hexhash":"5680e9d3d128aa737bc6d40e8a95d298c1a4349b"}

The hexhash value doesn't need to be shown and makes the output more complex.

[sffc]

The motivation for hexhash was:

1. Track a test across data versions
2. Link hexhash to known issues

We ended up doing known issues differently, so (2) isn't relevant anymore. Is the hexhash still useful for (1)? I guess clients can just compute the hexhash on the fly instead of storing it in the input json?