Use default timeout for launching the browser in WBT

[ilonatommy]

Contributes to #107771.
In the worst case launching the browser now will take 90 sec - we have 3 tries. It can prolong the execution of tests but it might also decrease the number of hits in the known issue till we find a real fix.

We always use SpawnBrowserAsync with default parameter value:

runtime/src/mono/wasm/Wasm.Build.Tests/TestAppScenarios/InterpPgoTests.cs

Line 54 in 3ca4ec8

IBrowser browser = await runner.SpawnBrowserAsync(url);

and

runtime/src/mono/wasm/Wasm.Build.Tests/BrowserRunner.cs

Line 157 in 3ca4ec8

var browser = await SpawnBrowserAsync(urlString, headless, language: language);

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[chcosta]

/azp run

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[chcosta]

/azp run runtime

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