CAMEL-23594: Fix kamelet properties being URL-encoded in YAML DSL

[davsclaus]

Summary

• Fix kamelet parameter values being URL-encoded by the YAML DSL but never decoded, because KameletComponent uses useRawUri()=true. Values like application/json were arriving as application%2Fjson in kamelet templates, causing HTTP 415 errors in kamelet integration tests.
• The root cause is YamlRoutesBuilderLoader calling URISupport.createQueryString(params) which defaults to encode=true. Changed to createQueryString(params, !kamelet) to skip encoding for kamelet URIs, matching what KameletDeserializer and YamlSupport already do.
• Added test in KameletTest.groovy verifying that property values containing / pass through YAML parameters: block to kamelet templates unencoded.

Supersedes #23391 with a source-level fix instead of decoding at the destination.

Test plan

• KameletTest suite passes (14 tests including new encoding test)
• CI validates camel-yaml-dsl and camel-kamelet modules
• Verify kamelet integration tests in camel-kamelets repo no longer fail with URL-encoded content types

Claude Code on behalf of Claus Ibsen

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🧪 CI tested the following changed modules:

• docs
• dsl/camel-yaml-dsl/camel-yaml-dsl

All tested modules (8 modules)

• Camel :: JBang :: MCP
• Camel :: JBang :: Plugin :: Route Parser
• Camel :: JBang :: Plugin :: TUI
• Camel :: JBang :: Plugin :: Validate
• Camel :: Launcher :: Container
• Camel :: YAML DSL
• Camel :: YAML DSL :: Validator
• Camel :: YAML DSL :: Validator Maven Plugin

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