[SDL] CSCAN-GENERAL0060 - File: tests/Aspire.Hosting.Tests/RabbitMQ/AddRabbitMQTests.cs

[RussKie]

This is a compliance issue, though since we're not using real credentials this is a "false positive". The issue was introduced by #3023.

https://dev.azure.com/dnceng/internal/_build/results?buildId=2414475&view=logs&j=bc38e8b8-e027-53cb-48e7-2adbd1070eca&t=d1aba2c3-5b21-511d-f336-affeabd629f9&l=52

Credential Scanner Error CSCAN-GENERAL0060 - File: tests/Aspire.Hosting.Tests/RabbitMQ/AddRabbitMQTests.cs. Line: 61. Column 1. 
Signature: e8715d14a0866d36d90e86bd39d2fdb641fed797b3870339d9b47f0cd739b1a6
Tool: Credential Scanner: Rule: CSCAN-GENERAL0060 (Found General Password.). 
{Searcher}CSCAN-GENERAL0060
{Code}See AddRabbitMQTests.cs line 61 for the code resulting in match
{Info}Found General Password.
{Suggest}Validate file contains secrets, remove, roll credential, and use approved store. For additional information on secret remediation see https://aka.ms/credscan 

My understanding the scanner isn't liking guest:pass1 part of Assert.Equal("amqp://guest:pass1@localhost:27011", connectionString); line.
@eerhardt could you please have it remediated.