8361613: System.console() should only be available for interactive terminal

[naotoj]

In prior JDK releases, System.console() could return a Console instance even when the JVM was not attached to an interactive terminal. This could lead to confusion, particularly when input was not from a keyboard or output was redirected, such as to or from a file or pipe, especially when using methods like readPassword(). Starting with JDK 25, the default behavior has changed: System.console() now returns null if standard input and/or output is redirected. However, if a JLine-based Console implementation is explicitly specified via the system property -Djdk.console=jdk.internal.le, the previous behavior may still occur.
This PR aims to align the behavior of the JLine-based Console implementation with the default System.console() behavior. The actual code change is a one-liner in JdkConsoleProviderImpl.java; the rest of the changes are adjustments to test cases to reflect the updated behavior. A corresponding CSR has also been drafted.

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Change requires CSR request JDK-8361911 to be approved
• Commit message must refer to an issue

Issues

• JDK-8361613: System.console() should only be available for interactive terminal (Bug - P4)
• JDK-8361911: System.console() should only be available for interactive terminal (CSR)

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