Added app name as hash salt for css modules ident

[pstrh]

Fixes CSS Module class name collisions (#9134 and #10190) by adding the app name as a hash salt. The change preserves #6875. The css module hash is stable within the project but globally unique (as long as the app name is unique).

Test steps:

• Create an application
• Create a App.module.css, import and use it in App.js
• Start the application and check the generated hash
• Stop the application and change appName in package.json
• Start the application and check the generated hash

Previous: The generate css module hash stays the same.

Now: The generate css module hash changes as the app name has been changed.

Please let me know if you need more information.

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[pstrh]

With ccs-loader v6 / webpack v5 hashPrefix was removed in favor of hashSalt. hashSalt is undefined by default.

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[pstrh]

Fixes #11775. base64url encoding (introduced in node 14) prevents + and / in generated hashes.