Update LICENSE name in NuGet packaging pipelines (#17183)

### Description
Updates NuGet packaging pipelines to use the correct license name.

### Motivation and Context
The license name changed. See #17170
The QNN_Windows_Nuget and Zip-Nuget-* pipelines will not run without this update.

tools/ci_build/github/azure-pipelines/qnn-ep-nuget-packaging-pipeline.yml

@@ -90,7 +90,6 @@ jobs:
         displayName: 'Generating nuspec for the native Nuget package x64'
         inputs:
           script: |
-            copy $(Build.SourcesDirectory)\LICENSE $(Build.SourcesDirectory)\LICENSE.txt
             python "$(Build.SourcesDirectory)\tools\nuget\generate_nuspec_for_native_nuget.py" --package_version ${{ parameters.ort_package_version }} --package_name Microsoft.ML.OnnxRuntime.QNN --target_architecture x64 --build_config ${{ parameters.build_config }} --native_build_path=$(Build.BinariesDirectory)\Windows\${{ parameters.build_config }}\${{ parameters.build_config }} --packages_path $(Build.BinariesDirectory)\Windows\packages --ort_build_path $(Build.BinariesDirectory)\Windows --sources_path $(Build.SourcesDirectory) --commit_id $(OnnxRuntimeGitCommitHash) --is_release_build ${{ parameters.IsReleaseBuild }} --sdk_info ${{ parameters.qnn_sdk_info }}
             cd $(Build.BinariesDirectory)\Windows\${{ parameters.build_config }}\${{ parameters.build_config }}
             nuget pack NativeNuget.nuspec
@@ -179,7 +178,6 @@ jobs:
         displayName: 'Generating nuspec for the native Nuget package arm64'
         inputs:
           script: |
-            copy $(Build.SourcesDirectory)\LICENSE $(Build.SourcesDirectory)\LICENSE.txt
             python "$(Build.SourcesDirectory)\tools\nuget\generate_nuspec_for_native_nuget.py" --package_version ${{ parameters.ort_package_version }} --package_name Microsoft.ML.OnnxRuntime.QNN --target_architecture arm64 --build_config ${{ parameters.build_config }} --native_build_path=$(Build.BinariesDirectory)\Win_arm64\${{ parameters.build_config }}\${{ parameters.build_config }} --packages_path $(Build.BinariesDirectory)\Win_arm64\packages --ort_build_path $(Build.BinariesDirectory)\Win_arm64 --sources_path $(Build.SourcesDirectory) --commit_id $(OnnxRuntimeGitCommitHash) --is_release_build ${{ parameters.IsReleaseBuild }} --sdk_info ${{ parameters.qnn_sdk_info }}
             cd $(Build.BinariesDirectory)\Win_arm64\${{ parameters.build_config }}\${{ parameters.build_config }}
             nuget pack NativeNuget.nuspec

tools/nuget/generate_nuspec_for_native_nuget.py

@@ -178,7 +178,7 @@ def generate_icon(line_list, icon_file):
 
 
 def generate_license(line_list):
-    line_list.append('<license type="file">LICENSE.txt</license>')
+    line_list.append('<license type="file">LICENSE</license>')
 
 
 def generate_project_url(line_list, project_url):
@@ -1101,7 +1101,7 @@ def generate_files(line_list, args):
     files_list.append("<file src=" + '"' + os.path.join(args.sources_path, "README.md") + '" target="README.md" />')
 
     # Process License, ThirdPartyNotices, Privacy
-    files_list.append("<file src=" + '"' + os.path.join(args.sources_path, "LICENSE") + '" target="LICENSE.txt" />')
+    files_list.append("<file src=" + '"' + os.path.join(args.sources_path, "LICENSE") + '" target="LICENSE" />')
     files_list.append(
         "<file src="
         + '"'