User Story 37654: Create Extensions base package

- Added default values to extensionsPackageVersion parameters.

Author: paulmedynski

eng/pipelines/common/templates/jobs/ci-build-nugets-job.yml

@@ -31,6 +31,7 @@ parameters:
   - name: extensionsPackageVersion
     displayName: Extensions Package Version Override
     type: string
+    default: ''
 
 jobs:
 - job: build_nugets

eng/pipelines/common/templates/steps/ci-project-build-step.yml

@@ -37,6 +37,7 @@ parameters:
   - name: extensionsPackageVersion
     displayName: Extensions Package Version Override
     type: string
+    default: ''
 
 steps:
 - template: ./ensure-dotnet-version.yml@self

eng/pipelines/dotnet-sqlclient-ci-core.yml

@@ -37,6 +37,7 @@ parameters:
 - name: extensionsPackageVersion
   displayName: Extensions Package Version Override
   type: string
+  default: ''
 
 - name: useManagedSNI
   displayName: |

eng/pipelines/stages/ci-build-extensions-package-stage.yml

@@ -32,6 +32,7 @@ parameters:
   - name: packageVersion
     displayName: Package Version Override
     type: string
+    default: ''
 
   # The name of the pipeline artifacts that will contain the package.
   - name: pipelineArtifactsName