Fix Web App workflows (#3423)

* Fix Web App workflows

* Update Yarn to 4.4.0

web-app/Makefile

@@ -3,12 +3,12 @@ default: build-static
 build-static:
 	@echo "Building frontend static assets to 'build'"
 	@if [ -f "${NVM_DIR}/nvm.sh" ]; then \. "${NVM_DIR}/nvm.sh" && nvm install && nvm use; fi && \
-	  NODE_OPTIONS=--openssl-legacy-provider yarn build
+	  yarn build
 
 build-static-istanbul-coverage:
 	@echo "Building frontend static assets to 'build'"
 	@if [ -f "${NVM_DIR}/nvm.sh" ]; then \. "${NVM_DIR}/nvm.sh" && nvm install && nvm use; fi && \
-	  NODE_OPTIONS=--openssl-legacy-provider yarn buildistanbulcoverage
+	  yarn buildistanbulcoverage
 
 test-warnings:
 	./check-warnings.sh