```release-note:change
auth: `auth enable` returns an error and `POST /sys/auth/:type` endpoint
reports an error for `Pending Removal` auth methods.
```
```release-note:change
secrets: `secrets enable` returns an error and `POST /sys/mount/:type` endpoint
reports an error for `Pending Removal` secrets engines.
```
```release-note:improvement
core: Handle and log deprecated builtin mounts. Introduces
`VAULT_ALLOW_PENDING_REMOVAL_MOUNTS` to override shutdown and error when
attempting to mount `Pending Removal` builtin plugins.
```
