CAMEL-23385: Fix watch mode exit and terminal resource leak

[gnodet]

CAMEL-23385

Follow-up to #23121 — fixes three bugs introduced in the watch mode implementation:

1. Shadowed running variable prevents watch exit: ActionWatchCommand.doCall() declared a local AtomicBoolean running that shadowed the field. The waitForUserEnter() method set the field to false, but the loop checked the local — so pressing Enter could never exit the watch loop.

2. CamelRouteDiagramAction.waitForUserEnter() never signals stop: The override read a line from lineReader but never called running.set(false), so even without the shadowing bug, the loop would continue after the user pressed Enter.

3. Terminal resource leak: The terminal opened in doCall() was stored as a field but never closed. Wrapped in try/finally to ensure cleanup.

[github-actions]

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[github-actions]

🧪 CI tested the following changed modules:

• dsl/camel-jbang/camel-jbang-core

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mvn verify -f dsl/camel-jbang/camel-jbang-it -Djbang-it-test

All tested modules (6 modules)

• Camel :: JBang :: Core
• Camel :: JBang :: MCP
• Camel :: JBang :: Plugin :: Route Parser
• Camel :: JBang :: Plugin :: TUI
• Camel :: JBang :: Plugin :: Validate
• Camel :: Launcher :: Container

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