Extend GMA doc about v2 deprecation and v1 removal

- Fix links in other files after updating some headers

Changelog: deprecated

doc/user/clusters/management_project.md

@@ -20,7 +20,7 @@ privileges.
 
 This can be useful for:
 
-- Creating pipelines to install cluster-wide applications into your cluster, see [Install using GitLab CI/CD (beta)](applications.md#install-using-gitlab-cicd) for details.
+- Creating pipelines to install cluster-wide applications into your cluster, see [Install using GitLab CI/CD (beta)](applications.md#install-using-gitlab-cicd-deprecated) for details.
 - Any jobs that require `cluster-admin` privileges.
 
 ## Permissions

doc/user/project/clusters/protect/container_host_security/quick_start_guide.md

@@ -77,5 +77,5 @@ necessary components with GMAv2 and the cluster management project.
 
 **Related documentation links:**
 
-- [GitLab Managed Apps v1 (GMAv1)](../../../../clusters/applications.md#install-with-one-click)
+- [GitLab Managed Apps v1 (GMAv1)](../../../../clusters/applications.md#install-with-one-click-deprecated)
 - [GitLab Managed Apps v2 (GMAv2)](../../../../clusters/management_project.md)

doc/user/project/clusters/protect/container_network_security/quick_start_guide.md

@@ -149,5 +149,5 @@ necessary components with GMAv2 and the cluster management project.
 
 **Related documentation links:**
 
-- [GitLab Managed Apps v1 (GMAv1)](../../../../clusters/applications.md#install-with-one-click)
+- [GitLab Managed Apps v1 (GMAv1)](../../../../clusters/applications.md#install-with-one-click-deprecated)
 - [GitLab Managed Apps v2 (GMAv2)](../../../../clusters/management_project.md)