Filter all commands, leave no other commands

[philderbeast]

Fixes #12150.

$ cabal run cabal-install:exe:cabal -- --help > before-help.txt

$ cabal run cabal-install:exe:cabal -- --help > after-help.txt

$ diff before-help.txt after-help.txt --unified
...
 Command line interface to the Haskell Cabal infrastructure.
 
 See http://www.haskell.org/cabal/ for more information.
@@ -83,6 +67,8 @@
   v2-install             Install packages.
   v2-clean               Clean the package store and remove temporary files.
   v2-sdist               Generate a source distribution file (.tar.gz).
+  v2-outdated            Check for outdated dependencies.
+  v2-gen-bounds          Generate dependency bounds for packages in the project.
 
  [legacy command aliases]
   v1-build               Compile all/specific components.
@@ -98,12 +84,6 @@
   v1-copy                Copy the files of all/specific components to install locations.
   v1-register            Register this package with the compiler.
   v1-reconfigure         Reconfigure the package if necessary.
-
- [other]
-  new-gen-bounds         Generate dependency bounds for packages in the project.
-  v2-gen-bounds          Generate dependency bounds for packages in the project.
-  new-outdated           Check for outdated dependencies.
-  v2-outdated            Check for outdated dependencies.
   v1-gen-bounds          Generate dependency bounds.
 
 For more information about a command use:

---

• Patches conform to the coding conventions.
• Is this a PR that fixes CI? If so, it will need to be backported to older cabal release branches (ask maintainers for directions).

[Mikolaj]

Thank you.