Add a new dynamic_service DBM propagation mode

[amarziali]

What Does This Do

Introduces a new DD_DBM_PROPAGATION_MODE=dynamic_service value that combines service mode behaviour with automatic SQL base hash injection, without requiring users to separately set DD_DBM_INJECT_SQL_BASEHASH=true.

Setting dynamic_service is equivalent to:

DD_DBM_PROPAGATION_MODE=service
DD_DBM_INJECT_SQL_BASEHASH=true

Like service mode, dynamic_service injects service metadata tags (ddps, dddbs, ddh, dddb, dde, ddpv) and the base hash tag (ddsh) into comments. It does not inject traceparent (that remains exclusive to full mode).

Also removed unnecessary process tags injectSysConfig in tests

Motivation

Additional Notes

Contributor Checklist

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Jira ticket: [PROJ-IDENT]

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[chatgpt-codex-connector]

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[Copilot]

Pull request overview

Adds a new DBM propagation mode (dynamic_service) that behaves like service mode for comment injection while automatically enabling SQL base-hash injection (without requiring DD_DBM_INJECT_SQL_BASEHASH=true). This extends the DBM comment-injection configuration surface in Config and ensures JDBC instrumentation recognizes the new mode, with targeted forked tests verifying behavior.

Changes:

• Introduced dynamic_service as a DBM propagation mode and treated it as comment-injection enabled.
• Made dynamic_service implicitly enable isDbmInjectSqlBaseHash().
• Added JDBC forked tests for dynamic_service (no trace context injection; base-hash is injected) and removed an unnecessary process-tags sysconfig toggle from existing tests.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
internal-api/src/main/java/datadog/trace/api/Config.java	Adds dynamic_service constant; enables comment injection and base-hash injection when selected.
dd-java-agent/instrumentation/jdbc/src/main/java/datadog/trace/instrumentation/jdbc/JDBCDecorator.java	Treats dynamic_service as comment-injection enabled (no trace context injection unless full).
dd-java-agent/instrumentation/jdbc/src/test/groovy/JDBCDecoratorTest.groovy	Adds forked test asserting dynamic_service does not inject trace context.
dd-java-agent/instrumentation/jdbc/src/test/groovy/DBMInjectionForkedTest.groovy	Adds forked test asserting dynamic_service injects base hash but not traceparent; removes unnecessary sysconfig in base-hash test.

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