CI: suppress XML doc comment warnings and cosmetic build noise

NumSharp generates ~7,600 noisy build warnings that get picked up by
GitHub Actions' MSBuild problem matcher and displayed as annotations,
drowning out real issues. This adds -p:NoWarn to all build/pack steps
via a centralized DOTNET_NOWARN env var.

Uses %3B (URL-encoded semicolons) because MSBuild CLI treats raw ;
and , as property separators — a known MSBuild quoting issue.

Suppressed warning categories:

XML doc warnings (~7,200 instances — 83% of all warnings):
- CS1570: Badly formed XML in doc comments
- CS1571: Duplicate param tag
- CS1572: Param tag for non-existent parameter
- CS1573: Missing param tag
- CS1574: Unresolvable cref
- CS1587: XML comment not placed on valid element
- CS1591: Missing XML comment on public type/member
- CS1711: Typeparam for non-existent param
- CS1734: Paramref refers to non-existent param

Other cosmetic noise:
- CS8981: Type name only contains lowercase chars (360 instances) —
  intentional for NumPy API compatibility (class 'np')
- NU5048: PackageIconUrl deprecated (2 instances)

Preserved warnings (still visible in CI):
- CS0162: Unreachable code (860)
- CS0168/CS0219: Unused variables (128)
- CA1416: Platform compatibility (380)
- CS0109/CS0628/CS0659/CS0661/CS0693: Miscellaneous code issues

Author: Nucs

.github/workflows/build-and-release.yml

@@ -11,6 +11,13 @@ on:
 permissions: write-all
 
 env:
+  # Suppress noisy build warnings that clutter CI annotations.
+  # Uses %3B (URL-encoded semicolon) because MSBuild CLI treats raw ; and , as property separators.
+  # XML doc warnings (CS15xx, CS17xx): ~7,200 of ~8,700 total — malformed/missing doc comments
+  # CS8981: 'np' only contains lowercase chars — intentional for NumPy API compat
+  # NU5048: PackageIconUrl deprecated — cosmetic NuGet warning
+  DOTNET_NOWARN: CS1570%3BCS1571%3BCS1572%3BCS1573%3BCS1574%3BCS1587%3BCS1591%3BCS1711%3BCS1734%3BCS8981%3BNU5048
+
   # Exclude known-failing test classes and specific test methods from CI.
   # These are pre-existing bugs tracked in OpenBugs.cs and related test files.
   # When a bug is fixed, remove its exclusion here so CI catches regressions.
@@ -60,7 +67,7 @@ jobs:
         dotnet-quality: 'preview'
 
     - name: Build
-      run: dotnet build test/NumSharp.UnitTest/NumSharp.UnitTest.csproj --configuration Release
+      run: dotnet build test/NumSharp.UnitTest/NumSharp.UnitTest.csproj --configuration Release -p:NoWarn=${{ env.DOTNET_NOWARN }}
 
     - name: Test
       run: dotnet test test/NumSharp.UnitTest/NumSharp.UnitTest.csproj --configuration Release --no-build --verbosity normal --logger trx --filter "${{ env.TEST_FILTER }} ${{ matrix.extra_filter }}"
@@ -105,6 +112,7 @@ jobs:
       run: |
         dotnet build src/NumSharp.Core/NumSharp.Core.csproj \
           --configuration Release \
+          -p:NoWarn=${{ env.DOTNET_NOWARN }} \
           -p:Version=${{ steps.version.outputs.VERSION }} \
           -p:AssemblyVersion=${{ steps.version.outputs.ASSEMBLY_VERSION }} \
           -p:FileVersion=${{ steps.version.outputs.ASSEMBLY_VERSION }} \
@@ -113,6 +121,7 @@ jobs:
 
         dotnet build src/NumSharp.Bitmap/NumSharp.Bitmap.csproj \
           --configuration Release \
+          -p:NoWarn=${{ env.DOTNET_NOWARN }} \
           -p:Version=${{ steps.version.outputs.VERSION }} \
           -p:AssemblyVersion=${{ steps.version.outputs.ASSEMBLY_VERSION }} \
           -p:FileVersion=${{ steps.version.outputs.ASSEMBLY_VERSION }} \
@@ -127,6 +136,7 @@ jobs:
           --configuration Release \
           --no-build \
           --output artifacts/nuget \
+          -p:NoWarn=${{ env.DOTNET_NOWARN }} \
           -p:Version=${{ steps.version.outputs.VERSION }} \
           -p:AssemblyVersion=${{ steps.version.outputs.ASSEMBLY_VERSION }} \
           -p:FileVersion=${{ steps.version.outputs.ASSEMBLY_VERSION }} \
@@ -136,6 +146,7 @@ jobs:
           --configuration Release \
           --no-build \
           --output artifacts/nuget \
+          -p:NoWarn=${{ env.DOTNET_NOWARN }} \
           -p:Version=${{ steps.version.outputs.VERSION }} \
           -p:AssemblyVersion=${{ steps.version.outputs.ASSEMBLY_VERSION }} \
           -p:FileVersion=${{ steps.version.outputs.ASSEMBLY_VERSION }} \