Fix various legacy problems (#37092)

1.  Fix #36439
2. Fix #37089
3. Fix incorrect layout of admin auth oidc page
4. Fix #35866
5. Fix #35800
6. Fix #36243

go.mod

@@ -109,7 +109,6 @@ require (
 	github.com/yohcop/openid-go v1.0.1
 	github.com/yuin/goldmark v1.8.2
 	github.com/yuin/goldmark-highlighting/v2 v2.0.0-20230729083705-37449abec8cc
-	github.com/yuin/goldmark-meta v1.1.0
 	gitlab.com/gitlab-org/api/client-go v1.46.0
 	go.yaml.in/yaml/v4 v4.0.0-rc.3
 	golang.org/x/crypto v0.49.0
@@ -283,7 +282,6 @@ require (
 	golang.org/x/tools v0.43.0 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20260401020348-3a24fdc17823 // indirect
 	gopkg.in/warnings.v0 v0.1.2 // indirect
-	gopkg.in/yaml.v2 v2.4.0 // indirect
 )
 
 ignore (