chore(release): bump on-prem to 1.7.0

Stamps Worker, Web, Core, Shared assemblies + Worker User-Agent +
WorkerHeartbeat.Version with 1.7.0 for the onprem-v1.7.0 release.

Changes since onprem v1.6.0 (Azure-native work merged via PR #13, plus
on-prem-affecting additive items):
  - Core: IKekProvider + KeyVaultKekProvider + PbKdf2KekProvider (used by
    Azure stack; opt-in for on-prem)
  - Core: SealedPayloadCodec + DEK sealing service + InMemoryReplayProtectionStore
  - Worker/Web: optional LogAnalyticsAuditMirror decorator (no behavior
    change unless Audit:LogAnalytics:* is configured)
  - Web: app version shown in sidebar footer
  - Core: ConfigurationProvider.CreateStaticOnly factory (used by HybridAgent)

Backward compatible with existing on-prem deployments at v1.6.0; no
config changes required.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: robgrame

Directory.Build.props

@@ -6,10 +6,10 @@
     row's Version column, and the published assembly stamps in one place.
   -->
   <PropertyGroup>
-    <Version>1.6.0</Version>
-    <AssemblyVersion>1.6.0.0</AssemblyVersion>
-    <FileVersion>1.6.0.0</FileVersion>
-    <InformationalVersion>1.6.0</InformationalVersion>
+    <Version>1.7.0</Version>
+    <AssemblyVersion>1.7.0.0</AssemblyVersion>
+    <FileVersion>1.7.0.0</FileVersion>
+    <InformationalVersion>1.7.0</InformationalVersion>
 
     <Company>robgrame</Company>
     <Product>BitLocker Key Monitor</Product>