[#2516] Hide user prompt if stdin is not connected to a terminal

[dchenz]

• Moved prompt into parent method and check if there's a tty.
• Removed the builtin prompt provided by Console.readPassword.
• Fixed existing interactive tests that rely on tty=true.
• Added test cases for tty=false asserting stdout is empty.

Manual testing using the cryptomator CLI use case mentioned in the issue.

$ cryptomator-cli create /tmp/testVault --password:stdin
Enter value for --password:stdin (Passphrase, read from STDIN): <type password>
Confirm passphrase: <type password>

[main] INFO  o.c.cli.Create - Vault created successfully in /tmp/testVault

$ echo test123 | cryptomator-cli create /tmp/testVault --password:stdin
[main] INFO  o.c.cli.Create - Vault created successfully in /tmp/testVault

Fixes #2516