perf(repo): fetch the initial commit instead of pushing it (#39628)

Creating a repository with an initial commit, via `auto_init` or a
template with git content, pushed that commit through receive-pack and
three server-side hooks that do nothing for this internal push except
refresh server info. Fetching it into the bare repository instead makes
such repository creation about 3.7x faster locally (median 790ms to
214ms). E2E tests that create initialized repositories get about
0.2-0.3s faster each.

1. Run `update-server-info` after template content generation, which the
push's `post-receive` hook did before.
2. Remove the now unused `InternalPushingEnvironment` and
`PushOptions.LocalRefName`.

cmd/hook.go

@@ -169,10 +169,6 @@ func parseGitHookCommitRefLine(line string) (oldCommitID, newCommitID string, re
 }
 
 func runHookPreReceive(ctx context.Context, c *cli.Command) error {
-	if isInternal, _ := strconv.ParseBool(os.Getenv(repo_module.EnvIsInternal)); isInternal {
-		return nil
-	}
-
 	setup(ctx, c.Bool("debug"))
 
 	if len(os.Getenv("SSH_ORIGINAL_COMMAND")) == 0 {
@@ -280,10 +276,6 @@ Gitea or set your environment appropriately.`, "")
 // runHookUpdate avoid to do heavy operations on update hook because it will be
 // invoked for every ref update which does not like pre-receive and post-receive
 func runHookUpdate(_ context.Context, c *cli.Command) error {
-	if isInternal, _ := strconv.ParseBool(os.Getenv(repo_module.EnvIsInternal)); isInternal {
-		return nil
-	}
-
 	// Update is empty and is kept only for backwards compatibility
 	if len(os.Args) < 3 {
 		return nil
@@ -304,11 +296,6 @@ func runHookPostReceive(ctx context.Context, c *cli.Command) error {
 		return fmt.Errorf("failed to call 'git update-server-info': %w", err)
 	}
 
-	// Now if we're an internal don't do anything else
-	if isInternal, _ := strconv.ParseBool(os.Getenv(repo_module.EnvIsInternal)); isInternal {
-		return nil
-	}
-
 	if len(os.Getenv("SSH_ORIGINAL_COMMAND")) == 0 {
 		if setting.OnlyAllowPushIfGiteaEnvironmentSet {
 			return fail(ctx, `Rejecting changes as Gitea environment not set.