HybridCache: enforce L2 expiration

[mgravell]

fix #5824

L1 expiration was being allowed to exceed the original L2 expiration, via either:

1. intentional (mis)configuration with larger L1 expiration
2. loading from L2 into L1 inside the local expiration window, which should trim to L2, but was just applying L1 window

Docs explicitly say "not exceeding the remaining overall cache lifetime", so we should not allow this in either case

Microsoft Reviewers: Open in CodeFlow