The imports table is no longer used and is dropped.
This frees up 136 GB of table space and 478 GB of indexes.
For golang/go#39629
Change-Id: I5a381832d9d4d69408fb62052782097436c40371
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/265242
Trust: Julie Qiu <julie@golang.org>
Run-TryBot: Julie Qiu <julie@golang.org>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jamal Carvalho <jamal@golang.org>
Julie Qiu