[tests] Use helix's retry mechanism for flaky tests (#3018)

In particular:
Aspire.EndToEnd.Tests: #2850

`Aspire.Npgsql.EntityFrameworkCore.PostgreSQL.Tests`, and
`Aspire.Microsoft.EntityFrameworkCore.SqlServer.Tests` get aborted with
timeout:

`Aborting test run: test run timeout of 600000 milliseconds exceeded.`

Related: https://github.com/dotnet/arcade/tree/main/src/Microsoft.DotNet.Helix/Sdk#test-retry

Author: radical

eng/test-configuration.json

@@ -0,0 +1,10 @@
+{
+  "version": 1,
+  "defaultOnFailure": "fail",
+  "localRerunCount": 1,
+  "retryOnRules": [
+    { "testAssembly": { "regex": "Aspire.EndToEnd.*" }, "failureMessage": { "regex": "App run failed" } },
+    { "testAssembly": { "regex": "Aspire.Npgsql.EntityFrameworkCore.PostgreSQL.*" } },
+    { "testAssembly": { "regex": "Aspire.Microsoft.EntityFrameworkCore.SqlServer.*" } }
+  ]
+}