Update dwsql-pipelines.yml (#1955)

## Why make this change?

- updating it to not to source secrets from pipeline

## What is this change?

- removing dependence on pipeline variable

## How was this tested?

- running the pipeline

Author: abhishekkumams

.pipelines/dwsql-pipelines.yml

@@ -147,7 +147,7 @@ jobs:
       # since windows needs a different string.
       # The variable setting on the pipeline UI sets the connection string
       # for the linux job above.
-      data-source.connection-string: $(ConnectionStringLocalDBVariable)
+      data-source.connection-string: Server=(localdb)\MSSQLLocalDB;Persist Security Info=False;Integrated Security=True;MultipleActiveResultSets=False;Connection Timeout=5;TrustServerCertificate=True;
       InstallerUrl: https://download.microsoft.com/download/7/c/1/7c14e92e-bdcb-4f89-b7cf-93543e7112d1/SqlLocalDB.msi
       SqlVersionCode: '15.0'