Do not store inactive repos (#1658)

Do not sync repos with forge if the repo is not necessary in DB.

In the DB, only repos that were active once or repos that are currently
active are stored. When trying to enable new repos, the repos list is
fetched from the forge instead and displayed directly. In addition to
this, the forge func `Perm` was removed and is now merged with `Repo`.

Solves a TODO on RepoBatch.

---------

Co-authored-by: Anbraten <anton@ju60.de>

server/forge/github/github_test.go

@@ -94,20 +94,6 @@ func Test_github(t *testing.T) {
 			})
 		})
 
-		g.Describe("Requesting repository permissions", func() {
-			g.It("Should return the permission details", func() {
-				perm, err := c.Perm(ctx, fakeUser, fakeRepo)
-				g.Assert(err).IsNil()
-				g.Assert(perm.Admin).IsTrue()
-				g.Assert(perm.Push).IsTrue()
-				g.Assert(perm.Pull).IsTrue()
-			})
-			g.It("Should handle a not found error", func() {
-				_, err := c.Perm(ctx, fakeUser, fakeRepoNotFound)
-				g.Assert(err).IsNotNil()
-			})
-		})
-
 		g.It("Should return a user repository list")
 
 		g.It("Should return a user team list")