Pre-initialize InvariantCulture such that it can be safely used when creating stack traces

[eduardo-vp]

The following assert is being hit when creating the stack trace in the test.

runtime/src/libraries/System.Private.CoreLib/src/System/Globalization/CultureInfo.cs

Lines 444 to 451 in 89cd18a

	public static CultureInfo InvariantCulture
	{
	get
	{
	Debug.Assert(s_InvariantCultureInfo != null, "[CultureInfo.InvariantCulture] s_InvariantCultureInfo is null");
	return s_InvariantCultureInfo;
	}
	}

Fixes #129159.

[Copilot]

Pull request overview

This PR changes CoreCLR startup to proactively run System.Globalization.CultureInfo’s class initializer during AppDomain::SetupSharedStatics(), so CultureInfo.InvariantCulture is initialized before stack trace generation paths might try to use it under extreme memory pressure (avoiding the checked-build assert observed in #129159).

Changes:

• During default AppDomain startup, force CultureInfo class initialization via CheckRunClassInitThrowing().
• Add a targeted comment documenting the motivation (stack trace creation under high memory pressure).

[eduardo-vp]

/azp list

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