use --ignore-project to install an unpacked package

[philderbeast]

Describe the bug
I'd like to use --ignore-project to install an unpacked package when this is unpacked within a project.

To Reproduce

$ git clone git@github.com:haskell/cabal.git
Cloning into 'cabal'...
remote: Enumerating objects: 126291, done.
remote: Counting objects: 100% (13879/13879), done.
remote: Compressing objects: 100% (1389/1389), done.
remote: Total 126291 (delta 12924), reused 12739 (delta 12425), pack-reused 112412
Receiving objects: 100% (126291/126291), 45.35 MiB | 25.92 MiB/s, done.
Resolving deltas: 100% (84268/84268), done.

$ cd cabal

$ cabal get hpack-0.35.3
Unpacking to hpack-0.35.3/

$ cd hpack-0.35.3/

$ cabal install --ignore-project
The package directory '.' does not contain any .cabal file.

$ ls *.cabal
hpack.cabal

$ cd ../..

$ cabal get hpack-0.35.3
Unpacking to hpack-0.35.3/

$ cd hpack-0.35.3/

$ cabal install --ignore-project --dry-run
Wrote tarball sdist to
/.../hpack-0.35.3/dist-newstyle/sdist/hpack-0.35.3.tar.gz
Resolving dependencies...
Build profile: -w ghc-9.4.5 -O1
In order, the following would be built (use -v for more details):
 - integer-conversion-0.1 (lib) (requires download & build)
 - text-iso8601-0.1 (lib) (requires download & build)
 - aeson-2.2.0.0 (lib) (requires download & build)
 - yaml-0.11.11.2 (lib) (requires download & build)
 - hpack-0.35.3 (lib) (requires build)
 - hpack-0.35.3 (exe:hpack) (requires build)
 
$ cabal --version
cabal-install version 3.10.1.0
compiled using version 3.10.1.0 of the Cabal library 

System information

$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 22.04.2 LTS
Release:	22.04
Codename:	jammy