CAMEL-23226: Standardize error output to use printErr() in camel-jbang

[gnodet]

JIRA: CAMEL-23226

Summary

Camel JBang commands used three inconsistent patterns for reporting errors to the user:

1. printer().printErr() — the correct approach, uses the Printer abstraction with ERROR: prefix
2. System.err.println() — bypasses Printer, no consistent prefix
3. printer().println() — sends errors to stdout, invisible in stderr-only logs

This PR standardizes all error output to use printer().printErr():

• Fix 14 commands across action, catalog, config, infra, plugin, update, and version packages
• Add unit tests for ConfigGet and PluginDelete error output

Test plan

• Verify error messages use ERROR: prefix in all fixed commands
• Run ConfigGetTest and PluginDeleteTest unit tests

[github-actions]

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[github-actions]

🧪 CI tested the following changed modules:

• dsl/camel-jbang/camel-jbang-core

All tested modules (26 modules)

• Camel :: Coverage
• Camel :: Coverage [pom]
• Camel :: JBang :: Core
• Camel :: JBang :: Core [jar]
• Camel :: JBang :: Integration tests
• Camel :: JBang :: Integration tests [jar]
• Camel :: JBang :: MCP
• Camel :: JBang :: MCP [jar]
• Camel :: JBang :: Main
• Camel :: JBang :: Main [jar]
• Camel :: JBang :: Plugin :: Edit
• Camel :: JBang :: Plugin :: Edit [jar]
• Camel :: JBang :: Plugin :: Generate
• Camel :: JBang :: Plugin :: Generate [jar]
• Camel :: JBang :: Plugin :: Kubernetes
• Camel :: JBang :: Plugin :: Kubernetes [jar]
• Camel :: JBang :: Plugin :: Route Parser
• Camel :: JBang :: Plugin :: Route Parser [jar]
• Camel :: JBang :: Plugin :: Testing
• Camel :: JBang :: Plugin :: Testing [jar]
• Camel :: JBang :: Plugin :: Validate
• Camel :: JBang :: Plugin :: Validate [jar]
• Camel :: Launcher
• Camel :: Launcher [jar]
• Camel :: Launcher :: Container
• Camel :: Launcher :: Container [pom]