[E3Experiments] Removed from WMF cluster

https://gerrit.wikimedia.org/r/gitweb?p=operations/mediawiki-config.git;a=commitdiff;h=1d72fba3461ad3e0a94ea5425e6ade65e5a96203
Very WMF centric, unlikely to be used by third parties

Change-Id: I6070af1734010a16e46373290693fa0a75ea5e8b