[Foward-Port of #14156] Add website- and storeview-code in stores admin grid

[aschrammel]

This PR is a forward-port of PR #14156 adds the webiste- and storeview-code in the stores admin grid like in Magento 1 stores overview.

Description

The PR joins additionally the code field from the store table to the admin grids row and adds the website code as well as the store view code in the respective renderers.

Fixed Issues (if relevant)

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Manual testing scenarios

1. Go to "Stores" > "Settings / All Stores"
2. Before applying the PR there are only listed Website, Store and StoreView by their names
3. After applying the PR there are the respective codes shown beneath the Website and StoreView names

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[mzeis]

@magento-engcom-team give me new test instance

[magento-engcom-team]

Hi @mzeis, here is your new test Magento instance

[mzeis]

Code looks good, thanks!

[magento-engcom-team]

Hi @mzeis, thank you for the review.
ENGCOM-1035 has been created to process this Pull Request

[mzeis]

Hi @aschrammel, your forward-port has been merged into 2.3-develop. Thank you very much!