Revert "Add an optional no-auto-gc flag for the git fetch."

This reverts commit 5163c5dcbe.

Reason for revert: git fetch doesn't have a --no-guto flag

Original change's description:
> Add an optional no-auto-gc flag for the git fetch.
>
> Bug: b/458222057
> Change-Id: Ibcd3128cc1968bc20bcb7d7f07c21ea0f690fafb
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/7143819
> Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
> Commit-Queue: Marc Jin <jmarc@google.com>
> Reviewed-by: Gavin Mak <gavinmak@google.com>

Bug: b/458222057
No-Tree-Checks: true
No-Try: true
Change-Id: Ie97b7028f3489a1b0e90e50a6314d03e602bcc5c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/7152220
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Gavin Mak <gavinmak@google.com>
Auto-Submit: Garrett Beaty <gbeaty@google.com>
Reviewed-by: Gavin Mak <gavinmak@google.com>

recipes/README.recipes.md

@@ -447,7 +447,7 @@ Returns:
 
 Returns a git command step.
 
-— **def [bundle\_create](/recipes/recipe_modules/git/api.py#395)(self, bundle_path, rev_list_args=None, \*\*kwargs):**
+— **def [bundle\_create](/recipes/recipe_modules/git/api.py#390)(self, bundle_path, rev_list_args=None, \*\*kwargs):**
 
 Runs 'git bundle create' on a Git repository.
 
@@ -461,7 +461,7 @@ Args:
 
 Outputs the contents of a file at a given revision.
 
-— **def [checkout](/recipes/recipe_modules/git/api.py#106)(self, url, ref=None, dir_path=None, recursive=False, submodules=True, submodule_update_force=False, keep_paths=None, step_suffix=None, curl_trace_file=None, raise_on_failure=True, set_got_revision=False, remote_name=None, display_fetch_size=None, file_name=None, submodule_update_recursive=True, use_git_cache=False, progress=True, tags=False, depth=None, no_auto_gc=False):**
+— **def [checkout](/recipes/recipe_modules/git/api.py#106)(self, url, ref=None, dir_path=None, recursive=False, submodules=True, submodule_update_force=False, keep_paths=None, step_suffix=None, curl_trace_file=None, raise_on_failure=True, set_got_revision=False, remote_name=None, display_fetch_size=None, file_name=None, submodule_update_recursive=True, use_git_cache=False, progress=True, tags=False, depth=None):**
 
 Performs a full git checkout and returns sha1 of checked out revision.
 
@@ -498,12 +498,11 @@ Args:
   * tags (bool): Also fetch tags.
   * depth (int): if > 0, limit fetching to the given number of commits from
     the tips of the remote tree.
-  * no_auto_gc: whether to turn off the automatic garbage collection.
 
 Returns: If the checkout was successful, this returns the commit hash of
   the checked-out-repo. Otherwise this returns None.
 
-— **def [config\_get](/recipes/recipe_modules/git/api.py#364)(self, prop_name, \*\*kwargs):**
+— **def [config\_get](/recipes/recipe_modules/git/api.py#359)(self, prop_name, \*\*kwargs):**
 
 Returns git config output.
 
@@ -530,7 +529,7 @@ Returns:
 
 Fetches all tags from the remote.
 
-— **def [get\_remote\_url](/recipes/recipe_modules/git/api.py#383)(self, remote_name=None, \*\*kwargs):**
+— **def [get\_remote\_url](/recipes/recipe_modules/git/api.py#378)(self, remote_name=None, \*\*kwargs):**
 
 Returns the remote Git repository URL, or None.
 
@@ -540,11 +539,11 @@ Args:
 
 Returns: (str) The URL of the remote Git repository, or None.
 
-— **def [get\_timestamp](/recipes/recipe_modules/git/api.py#335)(self, commit='HEAD', test_data=None, \*\*kwargs):**
+— **def [get\_timestamp](/recipes/recipe_modules/git/api.py#330)(self, commit='HEAD', test_data=None, \*\*kwargs):**
 
 Find and return the timestamp of the given commit.
 
-— **def [ls\_remote](/recipes/recipe_modules/git/api.py#476)(self, url, ref, name=None, \*\*kwargs):**
+— **def [ls\_remote](/recipes/recipe_modules/git/api.py#471)(self, url, ref, name=None, \*\*kwargs):**
 
 Request the head revision for a given ref using ls-remote. Raise a
 StepFailure if the ref does not exist, or more than one ref was found.
@@ -556,7 +555,7 @@ Args:
 
 Returns: A git revision.
 
-— **def [new\_branch](/recipes/recipe_modules/git/api.py#408)(self, branch, name=None, upstream=None, upstream_current=False, \*\*kwargs):**
+— **def [new\_branch](/recipes/recipe_modules/git/api.py#403)(self, branch, name=None, upstream=None, upstream_current=False, \*\*kwargs):**
 
 Runs git new-branch on a Git repository, to be used before git cl
 upload.
@@ -568,7 +567,7 @@ Args:
   * upstream_current (bool): whether to use '--upstream_current'.
   * kwargs: Forwarded to '__call__'.
 
-— **def [number](/recipes/recipe_modules/git/api.py#439)(self, commitrefs=None, test_values=None):**
+— **def [number](/recipes/recipe_modules/git/api.py#434)(self, commitrefs=None, test_values=None):**
 
 Computes the generation number of some commits.
 
@@ -585,7 +584,7 @@ A list of strings containing the generation numbers of the commits.
 If non-empty commitrefs was provided, the order of the returned
 numbers will correspond to the order of the provided commitrefs.
 
-— **def [rebase](/recipes/recipe_modules/git/api.py#344)(self, name_prefix, branch, dir_path, remote_name=None, \*\*kwargs):**
+— **def [rebase](/recipes/recipe_modules/git/api.py#339)(self, name_prefix, branch, dir_path, remote_name=None, \*\*kwargs):**
 
 Runs rebase HEAD onto branch