[FrameworkBundle] assets:install command should mirror .dotfiles (.htaccess)

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

The `assets:install` command currently ignores all *.dotfiles* when mirroring the `Resources\public` folders of bundles. This can lead to issues when *.htaccess* files are required for some public assets (ie.: CORS headers for font files to be served via Cloudfront).

Since the assets being installed are clearly in a folder called `public`, we can safely assume that those files are in fact supposed to be accessible and copy them over with the normal files.