Geo: Enable geo_skip_download_if_exists by default

What does this MR do and why?

Enable Geo feature by default: Skip first download if file exists !96935 (merged)

This feature has been enabled and verified in staging-ref.

#352530 (closed)

#435788 (closed)

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

How to set up and validate locally

Same as !96935 (merged) but no need to enable the feature flag.

doc/administration/geo/disaster_recovery/bring_primary_back.md

@@ -82,7 +82,7 @@ When a secondary site is added, if it contains data that would otherwise be sync
 
 - Git repositories are transferred by `git fetch`, which only transfers missing refs.
 - Geo's container registry sync code compares tags and only pulls missing tags.
-- [Blobs/files](#skipping-re-transfer-of-files) are skipped if they exist on the first sync.
+- [Blobs/files](#skipping-re-transfer-of-blobs-or-files) are skipped if they exist on the first sync.
 
 This behavior is useful when:
 
@@ -95,10 +95,10 @@ This behavior is useful when:
 
 ### Skipping re-transfer of blobs or files
 
-> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/352530) in GitLab 16.8 [with a flag](../feature_flags.md) named `geo_skip_download_if_exists`. Disabled by default.
+> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/352530) in GitLab 16.8 [with a flag](../../feature_flags.md) named `geo_skip_download_if_exists`. Disabled by default.
 
 FLAG:
-On self-managed GitLab, by default this feature is not available. To make it available, an administrator can [enable the feature flag](../feature_flags.md) named `geo_skip_download_if_exists`.
+On self-managed GitLab, by default this feature is not available. To make it available, an administrator can [enable the feature flag](../../feature_flags.md) named `geo_skip_download_if_exists`.
 On GitLab.com, this feature is not available.
 
 When you add a secondary site which has preexisting file data, then the secondary Geo site will avoid re-transferring that data. This applies to: