Consider subthemes of Claro and Gin as "supported"

Issue information

From user: jurgenhaas

Related to !132 (merged)

Contribution record

Fork management

Problem/Motivation

This is a follow-up on #3348716: Print a warning if the site is not using either Claro or Gin to avoid the warning about the unsupported admin theme if the current theme is a subtheme of either Claro or Gin.

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