Reduce memory consumption by avoiding adding items when queue is full.

[brentschmaltz]

Do not add items if cache is full or compacting.
Under heavy load, stress tests showed that the LRUCache was unable to keep up a change was made to avoid adding to the cache if we detect it was full or compacting.

A change to start TaskEventQ on startup instead of starting and stopping improves performance and simplifies the code.
We were not checking is a SignatureProvider was actually added to the cache. This is important as if the SignatureProvider is not added, the cache will not be able to properly apply the dispose logic and kernel objects could pile up.

[sruke]

Consider naming it TrySetValue to indicate the operation could succeed/fail

[brentschmaltz]

@sruke Good idea.
I kept the older methods as we had shipped them.

[github-actions]

Summary

Summary

Generated on:	5/29/2025 - 6:22:21 PM
Coverage date:	5/29/2025 - 5:58:30 PM - 5/29/2025 - 6:21:50 PM
Parser:	MultiReport (60x Cobertura)
Assemblies:	1
Classes:	7
Files:	2
Line coverage:	80.3% (620 of 772)
Covered lines:	620
Uncovered lines:	152
Coverable lines:	772
Total lines:	483
Branch coverage:	67.8% (228 of 336)
Covered branches:	228
Total branches:	336
Method coverage:	Feature is only available for sponsors

Coverage

Microsoft.IdentityModel.JsonWebTokens - 80.3%

Name	Line	Branch
Microsoft.IdentityModel.JsonWebTokens	80.3%	67.8%
Microsoft.IdentityModel.JsonWebTokens.JwtTokenUtilities	100%
System.Text.RegularExpressions.Generated	80.3%	67.8%
System.Text.RegularExpressions.Generated	80.3%	67.8%
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[keegan-caruso]

Suggested change

	private int _eventQueuePollingInterval = 50; // in milliseconds
	private readonly int _eventQueuePollingInterval = 50; // in milliseconds

[keegan-caruso]

Looks right, there are a few failing tests that need fixed, otherwise LGTM

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