[CT-2726] Fix error message when installing packages from dependencies.yml

[MichelleArk]

Currently, UninstalledPackagesFoundError's message is hard-coded to indicate packages are specified from packages.yml, even though they can be optionally be specified in dependencies.yml instead.

With uninstalled package under packages in dependencies.yml:

❯ dbt ls
14:55:05  Running with dbt=1.6.0-b4
14:55:05  target not specified in profile 'postgres', using 'default'
14:55:05  Registered adapter: postgres=1.6.0-b4
14:55:05  Encountered an error:
Compilation Error
  dbt found 1 package(s) specified in packages.yml, but only 0 package(s) installed in dbt_packages. Run "dbt deps" to install package dependencies.