Require manual confirmation to purge database with purge-db (#6154)

* Require manual confirmation to purge database

* Fix tests

* Rename to `purge-db-force and skip in non-interactive mode

* Do not skip when stdin_inputs is true

* Change prompt to be info logging to ensure consistent output

* Update warning text

* Move delete log after deletion

book/src/help_vm_import.md

@@ -121,6 +121,8 @@ Flags:
           contain sensitive information about your validator and so this flag
           should be used with caution. For Windows users, the log file
           permissions will be inherited from the parent folder.
+      --stdin-inputs
+          If present, read all user inputs from stdin instead of tty.
 ```
 
 <style> .content main {max-width:88%;} </style>