GitalyClient::RepositoryService: plugging in two HGitaly RPC methods

These are both implemented and necessary if there is no
Git repository.

--HG--
branch : heptapod
13 jobs for !289 with topic/heptapod/no-git-conversion in 53 minutes and 19 seconds (queued for 12 minutes and 50 seconds)
detached
Status Name Job ID Coverage
  Lint
passed rubocop #253074

00:17:44

 
  Test
passed rspec-regular 1/8 #253078

00:16:32

passed rspec-regular 2/8 #253079

00:16:29

passed rspec-regular 3/8 #253138

00:13:58

passed rspec-regular 4/8 #253081

00:17:22

passed rspec-regular 5/8 #253082

00:16:09

passed rspec-regular 6/8 #253083

00:21:23

passed rspec-regular 7/8 #253084

00:20:04

passed rspec-regular 8/8 #253085

00:18:07

passed workhorse:test using go 1.15 #253076

00:07:29

passed workhorse:test using go 1.16 #253077

00:11:03

passed workhorse:verify #253075

00:06:47

failed rspec-regular 3/8 #253080

00:15:12