feat(command-deploy): support hidden deployment folders

[monsonjeremy]

- Summary

This PR aims to fix an issue opened in the netlify/cli repository: netlify/cli#1227

The issue here is that the defaultFilter function aims to ignore hidden files within the deploy directory (which makes sense). Since it is not aware of the actual name of the deploy directory, it currently filters out the directory itself.

By creating a closure to encapsulate the new deployDir option, we can pass the name of the deploy folder into the filter and allow filtering inside that folder.

- Test plan

npx @docusaurus/init@next init my-website classic
cd my-website
mkdir .build
vim .build/index.html

# Insert some HTML into the file and save it
netlify deploy -d .build

Given these steps, Netlify should properly find and hash the files inside .build

- Description for the changelog

feat(command-deploy): support hidden deployment folders with -d flag

- A picture of a cute animal (not mandatory but encouraged)

[erezrokah]

Closing, see netlify/cli#1230 (comment)