Remove functions buildpacks from heroku/builder:22
#398
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A new functions only builder image variant was added in #392 (see that PR for why), and now the functions Kodon instances have been switched to use this new image in:
https://github.com/heroku/kodon/pull/408
As such, the functions buildpacks in
heroku/builder:22
are now unused and can be removed.In addition, the functions examples have been moved under the functions builder's directory, since it's now the only builder using them.
GUS-W-14194543.