Add test coverage for error.js utility module

[Copilot]

The error.js utility module lacked test coverage despite having complex JSON parsing logic with escaped quote handling and brace matching.

Test coverage added:

• extractErrorMessage: Tests for Axios errors (response.data), BPM SDK errors (response.body), Error objects, plain strings, and nested server error extraction from params arrays
• extractServerErrorFromMessage edge cases: Escaped quotes (\"), nested JSON objects, malformed JSON, missing required fields, unbalanced braces, multiple JSON-like strings in single message
• Form error detection: isFormElementError, isDeployedFormNotFoundError, extractDeployedFormName with resource name and key patterns

Example test for complex JSON extraction:

it('should extract nested server error from params', () => {
  const error = {
    response: {
      data: {
        params: ['Error occurred: {"type":"ProcessEngineException","message":"Engine error details"}']
      }
    }
  }
  expect(extractErrorMessage(error)).toBe('Engine error details')
})

it('should handle message with escaped quotes', () => {
  const error = {
    message: 'Error: {\\"type\\":\\"Exception\\",\\"message\\":\\"Escaped error\\"}'
  }
  expect(extractErrorMessage(error)).toBe('Escaped error')
})

58 test cases covering all exported functions, following existing test patterns from engineTokens.test.js and parser.test.js.

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