This continues on work in #5033 and #5034 which convert all http usage
to https to unblock CircleCI builds.
In #5034, mavenCentral() DSL was updated to explicitly target the https
maven repo because Gradle didn't force TLS 1.2 until v4.8.1 and many of
our examples use earlier versions of Gradle. The Kotlin meta generator
was missed because it is a .kts build file rather than build.gradle, and
the mustache filename doesn't have kts in it; the file was updated as if
it was build.gradle (groovy syntax).
* [meta] Support Kotlin meta generator
* Guard against automatic scripts (assumptions for this script are not fulfilled by some CI which run "run all" type scripts)
