R1:ac504f232fed

Projects - smooth out scenarios around renaming a project and slugs

Summary:
Fixes T7092. When you name project "Foo" which has primary hashtag "foo" to "Foobar", post this patch the hashtag "foo" gets added as a secondary hashtag. Also makes sure we don't normalize the hashtags in the query function as the wikimedia folks were hitting an issue around capitalization on the hashtag.

Note that T6909 remains "broken" in that you get an error that you can't do that, though if you just omit the additional…