Make "Build Theme" optional for browser based tests as that will not be...

Make "Build Theme" optional for browser based tests as that will not be executed for all projects, but still download the artefact if available

tests/lakedrops.yml

@@ -92,6 +92,8 @@ Test Backstop:
   needs:
     - job: Build Site
     - job: Build Theme
+      artifacts: true
+      optional: true
     - job: Import DB
       optional: true
     - job: Import DB NG
@@ -118,6 +120,8 @@ Test Cypress E2E:
   needs:
     - job: Build Site
     - job: Build Theme
+      artifacts: true
+      optional: true
     - job: Import DB
       optional: true
     - job: Import DB NG