[Client encryption]: Fixes missing files errors at time of nuget publishing. (#4896)

# Pull Request Template

## Description

Updated the Microsoft.Azure.Cosmos.Encryption package and
Microsoft.Azure.Cosmos.Encryption.Custom package so as to fix missing
icon.png and license.txt errors when publishing these packages locally.

## Type of change
Below the are the errors the project throws while publishing the nuget
package.
<img width="899" alt="image"
src="https://github.com/user-attachments/assets/301ac421-93b8-4cd6-90aa-3a49f1a18d55">
<img width="932" alt="image"
src="https://github.com/user-attachments/assets/b2a0ad13-ad13-4bd2-a659-2f21863b297b">

After the fix is implemented the nuget package publishes successfully.
<img width="937" alt="image"
src="https://github.com/user-attachments/assets/afc3d1c2-3d73-43f1-94c3-09c2061ba169">
<img width="954" alt="image"
src="https://github.com/user-attachments/assets/a21cf018-070d-432f-b91f-ba13ad5d3cb8">

- [X] Bug fix (non-breaking change which fixes an issue)
## Closing issues

To automatically close an issue: closes #IssueNumber

Author: aavasthy

Microsoft.Azure.Cosmos/src/Icon.png renamed to Icon.png

@@ -13,9 +13,8 @@
     <Title>Microsoft Azure Cosmos DB client-side encryption library for multi-tenant</Title>
     <PackageId>Microsoft.Azure.Cosmos.Encryption.Custom</PackageId>
     <PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
-    <PackageLicenseUrl>https://aka.ms/netcoregaeula</PackageLicenseUrl>
+    <PackageLicenseFile>LICENSE</PackageLicenseFile>
     <PackageProjectUrl>https://github.com/Azure/azure-cosmos-dotnet-v3</PackageProjectUrl>
-    <PackageIconUrl>http://go.microsoft.com/fwlink/?LinkID=288890</PackageIconUrl>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <PackageTags>microsoft;azure;cosmos;cosmosdb;documentdb;docdb;nosql;azureofficial;dotnetcore;netcore;netstandard;client;encryption;byok</PackageTags>
@@ -33,6 +32,14 @@
     <PackageReference Include="Microsoft.Azure.Cosmos" Version="3.41.0-preview.0" />
   </ItemGroup>
 
+  <ItemGroup>
+    <None Include="..\..\LICENSE" Pack="true" PackagePath="" Visible="false" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Include="..\..\Icon.png" Pack="true" PackagePath=""/>
+  </ItemGroup>
+
   <ItemGroup Condition=" '$(SdkProjectRef)' == 'True' ">
     <ProjectReference Include="..\..\Microsoft.Azure.Cosmos\src\Microsoft.Azure.Cosmos.csproj" />
   </ItemGroup>

Microsoft.Azure.Cosmos.Encryption.Custom/src/Microsoft.Azure.Cosmos.Encryption.Custom.csproj

@@ -17,9 +17,8 @@
     <Title>Microsoft Azure Cosmos DB client-side encryption library</Title>
     <PackageId>Microsoft.Azure.Cosmos.Encryption</PackageId>
     <PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
-    <PackageLicenseUrl>https://aka.ms/netcoregaeula</PackageLicenseUrl>
+    <PackageLicenseFile>LICENSE</PackageLicenseFile>
     <PackageProjectUrl>https://github.com/Azure/azure-cosmos-dotnet-v3</PackageProjectUrl>
-    <PackageIconUrl>http://go.microsoft.com/fwlink/?LinkID=288890</PackageIconUrl>
     <GeneratePackageOnBuild>false</GeneratePackageOnBuild>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
@@ -28,11 +27,19 @@
   <ItemGroup>
     <AdditionalFiles Include="..\..\Microsoft.Azure.Cosmos\src\stylecop.json" Link="stylecop.json" />
   </ItemGroup>
-	
+
   <ItemGroup Condition=" '$(SdkProjectRef)' != 'True' AND '$(IsPreview)' != 'True' ">
     <PackageReference Include="Microsoft.Azure.Cosmos" Version="[3.35.4,3.37.0]" />
   </ItemGroup>
 
+  <ItemGroup>
+    <None Include="..\..\Icon.png" Pack="true" PackagePath=""/>
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Include="..\..\LICENSE" Pack="true" PackagePath="" Visible="false" />
+  </ItemGroup>
+
   <ItemGroup Condition=" '$(SdkProjectRef)' != 'True' AND '$(IsPreview)' == 'True' ">
     <PackageReference Include="Microsoft.Azure.Cosmos" Version="3.37.0-preview" />
   </ItemGroup>

Microsoft.Azure.Cosmos.Encryption/src/Microsoft.Azure.Cosmos.Encryption.csproj

@@ -51,7 +51,7 @@
 
 	<ItemGroup>
 		<AdditionalFiles Include="stylecop.json" />
-		<None Include="Icon.png" Pack="true" PackagePath="\" />
+		<None Include="..\..\Icon.png" Pack="true" PackagePath=""/>
 	</ItemGroup>
 
 	<ItemGroup>