Changes to List agents

added the optional property agents/items/githubAppCredentialName to the response with the 200 status

the agents/items/name response's property pattern ^[A-Za-z0-9_-]+$ was added for the status 200

added the non-success response with the status 404

added the optional property agents/items/githubAppCredentialId to the response with the 200 status

added the optional property agents/items/serviceAccountId to the response with the 200 status

added the optional property agents/items/serviceAccountName to the response with the 200 status

added the optional property agents/items/createdByUserName to the response with the 200 status

removed the optional property agents/items/systemPrompt from the response with the 200 status

removed the optional property agents/items/templateId from the response with the 200 status

added the optional property agents/items/agentInstructions to the response with the 200 status

added the optional property agents/items/agentInstructionsTemplateId to the response with the 200 status

endpoint added