[dynamic control] complete the jsonkeyvalue and simpler validation migration

[jackshirazi]

Description:

Completing the transition to simpler validation and jsonkeyvalue
source name. Validation now is a simpler validate(SourceWrapper). More files in this PR but the changes are simple to see JSON->JSONKEYVALUE, and simpler validation

Existing Issue(s):

#2546

Testing:

Included

Documentation:

updated

Outstanding items:

[Copilot]

Pull request overview

Completes the dynamic-control migration to the JSONKEYVALUE source format and the simplified PolicyValidator.validate(SourceWrapper) validation flow, updating trace-sampling validation and related tests accordingly.

Changes:

• Removes legacy string/alias validation APIs in favor of validate(SourceWrapper) and shared dispatch via AbstractSourcePolicyValidator.
• Renames/realigns JSON handling to SourceFormat.JSONKEYVALUE and updates parsers/wrappers accordingly.
• Updates unit tests and file-provider parsing to use JSONKEYVALUE + KEYVALUE inputs.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
dynamic-control/src/main/java/io/opentelemetry/contrib/dynamic/policy/tracesampling/TraceSamplingValidator.java	Migrates trace-sampling validation to AbstractSourcePolicyValidator JSONKEYVALUE/KEYVALUE hooks.
dynamic-control/src/main/java/io/opentelemetry/contrib/dynamic/policy/PolicyValidator.java	Simplifies validator API to validate(SourceWrapper) only.
dynamic-control/src/main/java/io/opentelemetry/contrib/dynamic/policy/AbstractSourcePolicyValidator.java	Removes transitional JSON case and centralizes format dispatch + parsing helpers.
dynamic-control/src/main/java/io/opentelemetry/contrib/dynamic/policy/source/SourceFormat.java	Removes JSON format, keeps JSONKEYVALUE + KEYVALUE.
dynamic-control/src/main/java/io/opentelemetry/contrib/dynamic/policy/source/JsonSourceWrapper.java	Aligns wrapper format reporting and docs to JSONKEYVALUE.
dynamic-control/src/main/java/io/opentelemetry/contrib/dynamic/policy/LinePerPolicyFileProvider.java	Updates line parsing to use JSONKEYVALUE and policy-type-based validator selection.
dynamic-control/src/test/java/io/opentelemetry/contrib/dynamic/policy/tracesampling/TraceSamplingValidatorTest.java	Updates validator tests to parse via SourceFormat and adds KEYVALUE coverage.
dynamic-control/src/test/java/io/opentelemetry/contrib/dynamic/policy/source/SourceFormatTest.java	Updates SourceFormat tests for JSONKEYVALUE.
dynamic-control/src/test/java/io/opentelemetry/contrib/dynamic/policy/LinePerPolicyFileProviderTest.java	Updates file-provider tests to new JSONKEYVALUE/KEYVALUE inputs and validator API.