Fix: reference ConnectionStrings--PostgresVectorStore KV secret in deployment workflow

Both dev and prod KVs now have this secret managed by Terraform (azapi_resource in
configuration/env/dev/main.tf and configuration/env/prod/main.tf). This secret name
matches the actual config key it feeds (ConnectionStrings:PostgresVectorStore) and
eliminates the confusing remapping from connectionstrings--PostgresVectorDb.

This decouples the web app's postgres connection string from the Tooling pipeline's
connection string, which was sharing the same KV secret and causing breakage when
dev KV was updated to point to the dev PostgreSQL server.

Author: BenjaminMichaelis

.github/workflows/Build-Test-And-Deploy.yml

@@ -162,7 +162,7 @@ jobs:
               ai-endpoint=keyvaultref:$KEYVAULTURI/secrets/AIOptions--Endpoint,identityref:$MANAGEDIDENTITYID ai-apikey=keyvaultref:$KEYVAULTURI/secrets/AIOptions--ApiKey,identityref:$MANAGEDIDENTITYID \
               ai-vectordeployment=keyvaultref:$KEYVAULTURI/secrets/AIOptions--VectorGenerationDeploymentName,identityref:$MANAGEDIDENTITYID ai-chatdeployment=keyvaultref:$KEYVAULTURI/secrets/AIOptions--ChatDeploymentName,identityref:$MANAGEDIDENTITYID \
               ai-systemprompt=keyvaultref:$KEYVAULTURI/secrets/AIOptions--SystemPrompt,identityref:$MANAGEDIDENTITYID \
-              postgres-vectorstore-connectionstring=keyvaultref:$KEYVAULTURI/secrets/connectionstrings--PostgresVectorDb,identityref:$MANAGEDIDENTITYID
+              postgres-vectorstore-connectionstring=keyvaultref:$KEYVAULTURI/secrets/ConnectionStrings--PostgresVectorStore,identityref:$MANAGEDIDENTITYID
             az containerapp update --name $CONTAINER_APP_NAME --resource-group $RESOURCEGROUP --replace-env-vars Authentication__github__clientId=secretref:github-clientid Authentication__github__clientSecret=secretref:github-clientsecret \
               Authentication__microsoft__clientId=secretref:msft-clientid Authentication__microsoft__clientSecret=secretref:msft-clientsecret AuthMessageSender__ApiKey=secretref:emailsender-apikey AuthMessageSender__SecretKey=secretref:emailsender-secret \
               AuthMessageSender__SendFromName=secretref:emailsender-name AuthMessageSender__SendFromEmail=secretref:emailsender-email ConnectionStrings__EssentialCSharpWebContextConnection=secretref:connectionstring ASPNETCORE_ENVIRONMENT=Staging \
@@ -259,7 +259,7 @@ jobs:
               ai-endpoint=keyvaultref:$KEYVAULTURI/secrets/AIOptions--Endpoint,identityref:$MANAGEDIDENTITYID ai-apikey=keyvaultref:$KEYVAULTURI/secrets/AIOptions--ApiKey,identityref:$MANAGEDIDENTITYID \
               ai-vectordeployment=keyvaultref:$KEYVAULTURI/secrets/AIOptions--VectorGenerationDeploymentName,identityref:$MANAGEDIDENTITYID ai-chatdeployment=keyvaultref:$KEYVAULTURI/secrets/AIOptions--ChatDeploymentName,identityref:$MANAGEDIDENTITYID \
               ai-systemprompt=keyvaultref:$KEYVAULTURI/secrets/AIOptions--SystemPrompt,identityref:$MANAGEDIDENTITYID \
-              postgres-vectorstore-connectionstring=keyvaultref:$KEYVAULTURI/secrets/connectionstrings--PostgresVectorDb,identityref:$MANAGEDIDENTITYID
+              postgres-vectorstore-connectionstring=keyvaultref:$KEYVAULTURI/secrets/ConnectionStrings--PostgresVectorStore,identityref:$MANAGEDIDENTITYID
             az containerapp update --name $CONTAINER_APP_NAME --resource-group $RESOURCEGROUP --replace-env-vars Authentication__github__clientId=secretref:github-clientid Authentication__github__clientSecret=secretref:github-clientsecret \
               Authentication__microsoft__clientId=secretref:msft-clientid Authentication__microsoft__clientSecret=secretref:msft-clientsecret AuthMessageSender__ApiKey=secretref:emailsender-apikey AuthMessageSender__SecretKey=secretref:emailsender-secret \
               AuthMessageSender__SendFromName=secretref:emailsender-name AuthMessageSender__SendFromEmail=secretref:emailsender-email ConnectionStrings__EssentialCSharpWebContextConnection=secretref:connectionstring ASPNETCORE_ENVIRONMENT=Production \