Build: Restore deleted files and reconnect version history (svn:ignore follow-up).

Removes svn:ignore props that were excluding script package manifests [62143].

Developed in: #11064
Discussed in: https://core.trac.wordpress.org/ticket/64393

Follow-up to [62143].

Props desrosj, dmsnell, ellatrix.
See #64393.


git-svn-id: https://develop.svn.wordpress.org/trunk@62148 602fd350-edb4-49c9-b593-d223f7449a82

Author: dmsnell