chore: improve PomSanitizer detection and robustness

[gnodet]

Summary

Improve PomSanitizer in camel-jbang-mcp to close detection gaps and simplify internals:

• CDATA support: values wrapped in <![CDATA[...]]> were previously invisible to detection — now inspected and masked
• Camel placeholder recognition: {{vault:...}} and {{...}} placeholders are preserved alongside Maven ${...}
• URL-embedded credentials: new pattern detects ://user:password@host in any element (catches JDBC URLs, HTTP basic auth in non-sensitive-named elements like <db.url>)
• Additional keywords: connection-string, connectionstring, connection_string
• Single-pass processing: merged the separate detection and masking regex passes into one
• Minor cleanup: String.join replaces Collectors.joining, removed unused import

12 new test cases covering all additions.

Test plan

• mvn test -Dtest=PomSanitizerTest — all 30 tests pass
• Verify no regressions in existing MCP tool behavior

Claude Code on behalf of Guillaume Nodet

[github-actions]

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[github-actions]

🧪 CI tested the following changed modules:

• dsl/camel-jbang/camel-jbang-mcp

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• dsl/camel-jbang/camel-jbang-mcp: 1 test(s) disabled on GitHub Actions

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