[dynamic control] refactor TYPE to POLICY_TYPE for clarity

[jackshirazi]

No description provided.

[Copilot]

Pull request overview

This PR refactors the trace-sampling policy type constant name from TYPE to POLICY_TYPE to make its meaning clearer across the dynamic-control policy/trace-sampling implementation and tests.

Changes:

• Renamed TraceSamplingRatePolicy.TYPE to TraceSamplingRatePolicy.POLICY_TYPE.
• Updated production code (validator + implementer) to use the renamed constant.
• Updated tests to reference the renamed constant instead of string literals / old constant.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
dynamic-control/src/main/java/io/opentelemetry/contrib/dynamic/policy/tracesampling/TraceSamplingRatePolicy.java	Renames the public policy type constant and updates the superclass constructor arg.
dynamic-control/src/main/java/io/opentelemetry/contrib/dynamic/policy/tracesampling/TraceSamplingValidator.java	Uses POLICY_TYPE when reporting supported policy type.
dynamic-control/src/main/java/io/opentelemetry/contrib/dynamic/policy/tracesampling/TraceSamplingRatePolicyImplementer.java	Uses POLICY_TYPE when filtering incoming policies.
dynamic-control/src/test/java/io/opentelemetry/contrib/dynamic/policy/tracesampling/TraceSamplingValidatorTest.java	Updates test constant to point at POLICY_TYPE.
dynamic-control/src/test/java/io/opentelemetry/contrib/dynamic/policy/tracesampling/TraceSamplingRatePolicyImplementerTest.java	Updates type-only policy construction to use POLICY_TYPE.
dynamic-control/src/test/java/io/opentelemetry/contrib/dynamic/policy/LinePerPolicyFileProviderTest.java	Replaces "trace-sampling" literal with POLICY_TYPE.