CAMEL-22987: Add strict YAML DSL JSON Schema variant

[gnodet]

Summary

• Add a strict JSON Schema variant (camelYamlDsl-strict.json) that removes all implicit patterns from the YAML DSL schema: no string shorthands, no inline expressions, no oneOf/anyOf/not constructs
• The strict schema is ~25% smaller and significantly easier for tooling (IDEs, code generators, AI assistants) to process
• The classic schema (camelYamlDsl.json) is unchanged and continues to support all existing shorthands

Changes

• GenerateYamlSchemaMojo: new strict parameter that skips inline string shorthands, __extends expression merging, and oneOf grouping
• camel-yaml-dsl/pom.xml: second execution to generate the strict schema
• YamlValidator: new boolean strict constructor parameter to validate against either schema
• 7 new tests covering strict vs classic validation behavior
• Documentation in yaml-dsl.adoc explaining both schema variants with examples
• Upgrade guide entry in camel-4x-upgrade-guide-4_19.adoc

Test plan

• All 17 validator tests pass (10 existing + 7 new)
• Strict schema validates explicit forms correctly
• Strict schema rejects string shorthands (e.g. log: "${body}")
• Strict schema rejects inline expressions (e.g. setBody: { simple: "..." })
• Classic schema continues to accept both implicit and explicit forms
• CI build passes

[github-actions]

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[github-actions]

🧪 CI tested the following changed modules:

• docs
• dsl/camel-yaml-dsl/camel-yaml-dsl
• dsl/camel-yaml-dsl/camel-yaml-dsl-maven-plugin
• dsl/camel-yaml-dsl/camel-yaml-dsl-validator
• dsl/camel-yaml-dsl/camel-yaml-dsl

Full reactor (40 modules)

• Camel :: Coverage
• Camel :: Coverage [pom]
• Camel :: Docs
• Camel :: Docs [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 :: Kamelet Main
• Camel :: Kamelet Main [jar]
• Camel :: Launcher
• Camel :: Launcher [jar]
• Camel :: Launcher :: Container
• Camel :: Launcher :: Container [pom]
• Camel :: YAML DSL
• Camel :: YAML DSL [jar]
• Camel :: YAML DSL :: Deserializers
• Camel :: YAML DSL :: Deserializers [jar]
• Camel :: YAML DSL :: Maven Plugins
• Camel :: YAML DSL :: Maven Plugins [maven-plugin]
• Camel :: YAML DSL :: Validator
• Camel :: YAML DSL :: Validator [jar]
• Camel :: YAML DSL :: Validator Maven Plugin
• Camel :: YAML DSL :: Validator Maven Plugin [maven-plugin]

[github-actions]

✅ Parent POM dependency changes: targeted tests passed

Changed properties: smallrye-fault-tolerance-version

Affected modules (1)

• :camel-microprofile-fault-tolerance

[gnodet]

The CI failure here is caused by flaky camel-smb integration tests (unrelated to this PR). The SMB module was pulled into the incremental build by CI dependency detection and failed first in the reactor, causing all YAML DSL modules to be skipped.

This should be fixed by #22081 which addresses the SMB test issues. Once that's merged, re-running CI here should go green.

[apupier]

I think it will be worthy that some people from Kaoto review also this PR to see if the strict way is matching what is supported currently, or at least if there is no blocker to support it easily.

//cc @lordrip

Note that we will need to change the default when exporting from Camel JBang, updating most examples and publish it along the other one in Json schemastore