[aglinxinyuan]

What changes were proposed in this PR?

Removes obsolete validation state management and unused helper methods in agent-service:

• WorkflowState:
  • Drops internal validation state tracking (validationErrors, workflowEmpty, validationChangedSubject) and associated methods (getValidationChangedStream, getValidationOutput, setValidationError, clearValidationError, setAllValidationErrors, updateWorkflowEmptyState, emitValidationChanged). Property validation is handled directly by WorkflowSystemMetadata.validateOperatorProperties during tool execution.
  • Drops unused updateOperatorInputPorts, getLink, and getFrontierOperators.
• TexeraAgent:
  • Drops unused helper getStepsById().
• WorkflowSystemMetadata:
  • Drops unused helper methods getAllSchemasAsJson() and operatorTypeExists(), along with private interface OperatorSchemaInfo.
• types/workflow.ts:
  • Drops unused OperatorDetail interface.
• WorkflowResultState:
  • Drops unused helper method getOperatorInfo().

Any related issues, documentation, discussions?

Closes #9238

How was this PR tested?

Tested with Bun test runner in agent-service:

cd agent-service
bun test

Output:

313 pass
0 fail
765 expect() calls
Ran 313 tests across 19 files. [2.10s]

Was this PR authored or co-authored using generative AI tooling?

Generated-by: Antigravity 2.0

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Based on the git blame history of the changed files, we recommend the following reviewers:

• Contributors with relevant context: @yangzhang75, @bobbai00, @roshiiiz
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