CLDR has localisations for Konkani in the Devanagari script in the language code kok, while Mediawiki uses the code gom-deva for the same. This is likely to cause Mediawiki's CLDR extension to be unable to provide localisations in Konkani. There is a ticket in CLDR's bug tracking system to move the locale for Konkani (Devanagari script) from kok to gom-deva:
https://unicode-org.atlassian.net/browse/CLDR-17121
and another ticket to create the Konkani (Latin script) locale at gom-latn:
https://unicode-org.atlassian.net/browse/CLDR-17122
The ticket for the Latin script has the status as 'Accepted', which presumably means that we will see the CLDR locale being created, although we cannot be sure which code it will be created under.