chore(deps): update azure azure-sdk-for-net monorepo (minor)

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
Azure.DigitalTwins.Core (source)	1.4.0 → 1.6.0
Azure.Identity (source)	1.10.4 → 1.21.0
Microsoft.Azure.WebJobs.Extensions.EventGrid (source)	3.3.1 → 3.5.0
Microsoft.Azure.WebJobs.Extensions.SignalRService (source)	1.12.0 → 1.14.1

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Release Notes

Azure/azure-sdk-for-net (Azure.DigitalTwins.Core)

v1.6.0

Compare Source

1.6.0 (2026-01-28)

Other Changes

• The customer-facing SDK stats feature
  metric names have been updated to match the stable specification.
  • Metric names changed: preview.item.success.count → Item_Success_Count,
    preview.item.dropped.count → Item_Dropped_Count,
    preview.item.retry.count → Item_Retry_Count.
  • New environment variable: To enable, set environment variable
    APPLICATIONINSIGHTS_SDKSTATS_DISABLED=false.
  • The old environment variable APPLICATIONINSIGHTS_SDKSTATS_ENABLED_PREVIEW
    is no longer recognized.

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