[browser] Fragile WebSocket CI tests

[pavelsavara]

Error Blob

{
  "ErrorMessage": "MONO_WASM: WebSocket error",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Reproduction Steps

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=367878&view=results

Log

[10:30:30] warn: MONO_WASM: WebSocket error
[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 ---

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=367878
Error message validated: MONO_WASM: WebSocket error
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 8/9/2023 5:16:58 PM UTC

Report

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
0	0	0

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Issue Details

---

Error Blob

{
  "ErrorMessage": "MONO_WASM: WebSocket error",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Reproduction Steps

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=367878&view=results

Log

[10:30:30] warn: MONO_WASM: WebSocket error
[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 ---

Author:	pavelsavara
Assignees:	pavelsavara
Labels:	arch-wasm, blocking-clean-ci, area-System.Runtime.InteropServices.JavaScript, Known Build Error, os-browser
Milestone:	8.0.0