[mono] Update runtimeFlavor property for Mono AOT perf jobs

[kotlarmilos]

This PR updates the runtimeFlavor property for Mono AOT performance jobs.

[ghost]

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Issue Details

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This PR sets the runtimeFlavor property for Mono AOT performance jobs.

Author:	kotlarmilos
Assignees:	kotlarmilos
Labels:	area-Infrastructure-mono
Milestone:	8.0.0

[lewing]

[10:30:30] info: [2023-08-09T10:30:30.638Z] [FAIL] System.Net.WebSockets.Client.Tests.InvokerCloseTest.CloseOutputAsync_ClientInitiated_CanReceive_CanClose(server: ws://127.0.0.1:49166/WebSocket/EchoWebSocket.ashx)
[10:30:30] info: Assert.Equal() Failure
[10:30:30] info: Expected: 17
[10:30:30] info: Actual:   0
[10:30:30] info:    at System.Net.WebSockets.Client.Tests.CloseTest.CloseOutputAsync_ClientInitiated_CanReceive_CanClose(Uri server)
[10:30:30] info: --- End of stack trace from previous location ---
[10:30:30] info: [2023-08-09T10:30:30.639Z] [STRT] System.Net.WebSockets.Client.Tests.InvokerCloseTest.CloseOutputAsync_ClientInitiated_CanReceive_CanClose(server: wss://127.0.0.1:49168/WebSocket/EchoWebSocket.ashx)

[pavelsavara]

InvokerCloseTest.CloseOutputAsync_ClientInitiated_CanReceive_CanClose

Could be just fragile test, let's re-run

[pavelsavara]

I created #90257 to see if that happens more often

[kotlarmilos]

The failure doesn't look related to the changes in this PR, could be a transient issue.