fetch: only respect followRemoteHEAD with configured refspecs

The new followRemoteHEAD feature is triggered for almost every fetch, causing us to ask the server about the remote "HEAD" and to consider updating our local tracking HEAD symref. This patch limits the feature only to the case when we are fetching a remote using its configured refspecs (typically into its refs/remotes/ hierarchy). There are two reasons for this. One is efficiency. E.g., the fixes in 6c915c3f85 (fetch: do not ask for HEAD unnecessarily, 2024-12-06) and 20010b8c20 (fetch: avoid ls-refs only to ask for HEAD symref update, 2025-03-08) were aimed at reducing the work we do when we would not be able to update HEAD anyway. But they do not quite cover all cases. The remaining one is: git fetch origin refs/heads/foo:refs/remotes/origin/foo which _sometimes_ can update HEAD, but usually not. And that leads us to the second point, which is being simple and explainable. The code for updating the tracking HEAD symref requires both that we learned which ref the remote HEAD points at, and that the server advertised that ref to us. But because the v2 protocol narrows the server's advertisement, the command above would not typically update HEAD at all, unless it happened to point to the "foo" branch. Or even weirder, it probably _would_ update if the server is very old and supports only the v0 protocol, which always gives a full advertisement. This creates confusing behavior for the user: sometimes we may try to update HEAD and sometimes not, depending on vague rules. One option here would be to loosen the update code to accept the remote HEAD even if the server did not advertise that ref. I think that could work, but it may also lead to interesting corner cases (e.g., creating a dangling symref locally, even though the branch is not unborn on the server, if we happen not to have fetched it). So let's instead simplify the rules: we'll only consider updating the tracking HEAD symref when we're doing a full fetch of the remote's configured refs. This is easy to implement; we can just set a flag at the moment we realize we're using the configured refspecs. And we can drop the special case code added by 6c915c3f85 and 20010b8c20, since this covers those cases. The existing tests from those commits still pass. In t5505, an incidental call to "git fetch <remote> <refspec>" updated HEAD, which caused us to adjust the test in 3f763ddf28 (fetch: set remote/HEAD if it does not exist, 2024-11-22). We can now adjust that back to how it was before the feature was added. Even though t5505 is incidentally testing our new desired behavior, we'll add an explicit test in t5510 to make sure it is covered. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>