Remove experimental flag --Xenable-extra-debug-tracers

[usmansaleem]

PR description

This change makes the callTracer always available for debug_trace* RPC methods without requiring the experimental flag.

Changes:

• Remove static enableExtraTracers flag from DebugTraceTransactionStepFactory
• Delete DebugTracerOptions class entirely (no longer needed)
• Remove unstableDebugTracerOptions from BesuCommand
• Update CALL_TRACER to always use CallTracerResultConverter
• Update tests to remove flag assignments
• Update unit test to reflect CALL_TRACER as fully implemented
• Update CHANGELOG.md with breaking change notice

Breaking change: Users with scripts using --Xenable-extra-debug-tracers will need to remove this flag as it no longer exists.

Fixed Issue(s)

Thanks for sending a pull request! Have you done the following?

• Checked out our contribution guidelines?
• Considered documentation and added the doc-change-required label to this PR if updates are required.
• Considered the changelog and included an update if required.
• For database changes (e.g. KeyValueSegmentIdentifier) considered compatibility and performed forwards and backwards compatibility tests

Locally, you can run these tests to catch failures early:

• spotless: ./gradlew spotlessApply
• unit tests: ./gradlew build
• acceptance tests: ./gradlew acceptanceTest
• integration tests: ./gradlew integrationTest
• reference tests: ./gradlew ethereum:referenceTests:referenceTests
• hive tests: Engine or other RPCs modified?

[Gabriel-Trintinalia]

lgtm