dev/core#4923 CustomField - Don't index disabled fields

[colemanw]

Overview

Per dev/core#4923, don't waste the effort of indexing disabled fields.

[civibot]

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[civibot]

The issue associated with the Pull Request can be viewed at https://lab.civicrm.org/dev/core/-/issues/4923

[demeritcowboy]

Thanks I've put merge-ready just because there was some hesitation in the ticket.