Was this intentional? The condition is always true so `_installDependencies` is always called.

Verified by running:

`pnpx create-single-spa@4.1.4 --moduleType util-module --skipInstall`

```
? Directory for new project __test
? Which framework do you want to use? none
? Which package manager do you want to use? pnpm
? Will this project use Typescript? No
? Organization name (can use letters, numbers, dash or underscore) org
? Project name (can use letters, numbers, dash or underscore) proj
Initialized empty Git repository in /Users/deck/Workspaces/create-single-spa/__test/.git/

Initialized git repository

   create __test/package.json
   create __test/jest.config.js
   create __test/babel.config.json
   create __test/.eslintrc
   create __test/.prettierignore
   create __test/.gitignore
   create __test/.husky/pre-commit
   create __test/webpack.config.js
   create __test/src/org-proj.js

No change to package.json was detected. No package manager install will be executed.
Skipping install command: pnpm install

I'm all done. Just run pnpm install to install the required dependencies.
```

Adds the `skipGit` option to the SingleSpaGenerator. Refactors (dedupes + hoists) the git initialization routine. Moves git init to the `install` priority queue.