[Se] Validate infoblurb functionality for TypeSpec conversion

### Context

The TypeSpec team has a [plan for converting existing Azure services to TypeSpec](https://microsoft-my.sharepoint.com/:w:/g/personal/mattge_microsoft_com1/ER3nulfpzGxErW2woxS2KMEB6lNwzBe4CzM7FVQkHdK7-A?e=0WswMD). The process involves manual refinement of TypeSpec files (TSPs), validation through human reviews, and various work items assigned to different teams for approval and automation. The primary goal is to ensure that the converted TypeSpec generates an OpenAPI specification functionally equivalent to the original, maintaining round-trip correctness.

### Description

The Engineering Systems (EngSys) team needs to validate that the infoblurb functionality works correctly. The infoblurb is a message inserted into every brownfield PR for services not yet converted to TypeSpec. It should inform teams about the upcoming requirement to convert to TypeSpec and offer assistance, but it should not be flagged as a warning or error. This functionality must be verified to ensure it operates as intended.