Cache tags collision

First implementation of a short term solution:

• Prefix the tag hash with the first letter of the tag.
• Not perfect but will drastically decrease invalidation of different tag types.

Since the embedded cache tag hashing tries to fix the same thing as #2952277 it would make sense to use the minificator from that issue. So the MR I opened removes the existing mechanism and uses the minificator service instead (and thus depends on the patch from #2952277).