remove cpr

[tbeseda]

cpr has a couple warnings for vulnerabilities and will probably continue to decay as it's not maintained.

That said, we probably don't need it since Node 16.7+ supports the features of cpr we are using.

Most of this is:

- let cp = require('cpr')
+ let { cp } = require('fs')

-   cp(source, destination, { overwrite: true }, callback)
+   cp(source, destination, { recursive: true, force: true }, callback)

There was also some experimental tests on newer Ruby bundler - this was discarded.