[wasm][debugger] Remove non-deterministic signals from debugger tests.

[ilonatommy]

Fixes #75392.
Removes Task.Delay and Thread.Sleep from debugger tests.

• ExceptionTestUncaughtWithReload - using App_Ready is enough.
• CreateGoodBreakpointAndHitGoToNonWasmPageComeBackAndHitAgain: we are going to non-wasm page, so there's no runtime from which we could get info about being ready. Also, we cannot rely on any message passed from browser to notify the inspector in all cases because it would send notification for wasm as well. That's why we introduce a new mechanism of informing Inspector that tests are waiting for non-wasm loading and only then we can notify about runtime context being created.
• ExceptionTestAllWithReload had a Sleep that was in fact useless as SendCommandAndCheck waits for Inspector.PAUSE evant by default anyway.

[ghost]

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Issue Details

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Fixes #75392.
Removes Task.Delay and Thread.Sleep from debugger tests.

• ExceptionTestUncaughtWithReload - using App_Ready is enough.
• CreateGoodBreakpointAndHitGoToNonWasmPageComeBackAndHitAgain: we are going to non-wasm page, so there's no runtime from which we could get info about being ready. Also, we cannot rely on any message passed from browser to notify the inspector in all cases because it would send notification for wasm as well. That's why we introduce a new mechanism of informing Inspector that tests are waiting for non-wasm loading and only then we can notify about runtime context being created.
• ExceptionTestAllWithReload had a Sleep that was in fact useless as SendCommandAndCheck waits for Inspector.PAUSE evant by default anyway.

Author:	ilonatommy
Assignees:	ilonatommy
Labels:	arch-wasm, area-Debugger-mono
Milestone:	-