Fix HttpClient object leak described in #5948 (no socket exhaustion)#5949

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bgavrilMS wants to merge 10 commits intomainfrom

Commits on Apr 27, 2026

Update src/client/Microsoft.Identity.Client/PlatformsCommon/Shared/SimpleHttpClientFactory.cs

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Use Lazy<HttpClient> for thread-safe pooling; fix SF overload; add mTLS cert test; fix ResetStaticStateForTest

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Commits on Apr 28, 2026

Merge branch 'main' into bogavril/5948
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Add concurrent test asserting Lazy<HttpClient> guarantees single construction under contention

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Commits on Apr 30, 2026

Cache HttpClient in SF overload by delegate method+target identity to avoid socket exhaustion

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Commits on May 1, 2026

Revert Service Fabric HttpClient caching; SF overload returns new HttpClient per call

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