Move post-clone checkout of particular version prior to git-annex-init

This fixes datalad/datalad#6964 and suppossedly
makes everything less complex and faster.

However,
datalad/datalad@1d9315e
made this exact move in the opposite direction!

The test supplied in that change nevertheless continues to pass. It may
be that git-annex has learned to cope better with the original
complication.

datalad_next/patches/clone.py

@@ -176,6 +176,22 @@ def _post_gitclone_processing_(
         reckless=reckless,
     )
 
+    if checkout_gitsha and dest_repo.get_hexsha() != checkout_gitsha:
+        try:
+            # TODO now that this is guaranteed to run prior to git-annex-init
+            # the implementation of this helper could be simplified
+            postclone_checkout_commit(dest_repo, checkout_gitsha,
+                                      remote=remote)
+        except Exception:
+            # We were supposed to clone a particular version but failed to.
+            # This is particularly pointless in case of subdatasets and
+            # potentially fatal with current implementation of recursion.
+            # see gh-5387
+            lgr.debug(
+                "Failed to checkout %s, removing this clone attempt at %s",
+                checkout_gitsha, destds.path)
+            raise
+
     if knows_annex(destds.path):
         # init annex when traces of a remote annex can be detected
         yield from _pre_annex_init_processing_(
@@ -200,22 +216,6 @@ def _post_gitclone_processing_(
             reckless=reckless,
         )
 
-    if checkout_gitsha and \
-       dest_repo.get_hexsha(
-            dest_repo.get_corresponding_branch()) != checkout_gitsha:
-        try:
-            postclone_checkout_commit(dest_repo, checkout_gitsha,
-                                      remote=remote)
-        except Exception:
-            # We were supposed to clone a particular version but failed to.
-            # This is particularly pointless in case of subdatasets and
-            # potentially fatal with current implementation of recursion.
-            # see gh-5387
-            lgr.debug(
-                "Failed to checkout %s, removing this clone attempt at %s",
-                checkout_gitsha, destds.path)
-            raise
-
     yield from _pre_final_processing_(
         destds=destds,
         cfg=cfg,