Replace 'hasNpm' label with 'contintLabsSlave'

Updates jobs:

VisualEditor-npm
cxserver-npm
mediawiki-core-npm
mwext-Collection-OfflineContentGenerator-bundler-npmtest
mwext-Collection-OfflineContentGenerator-latex_renderer-npmtest
mwext-Collection-OfflineContentGenerator-npmtest
mwext-VisualEditor-npm
oojs-core-npm
oojs-ui-npm
parsoidsvc-deploy-parse-tool-check
parsoidsvc-deploy-parsertests-run-harder
parsoidsvc-deploy-roundtrip-test-check
parsoidsvc-source-parse-tool-check
parsoidsvc-source-parsertests-run-harder
parsoidsvc-source-roundtrip-test-check

Change-Id: I266403b4a657ae40ac310e7914766f5aa5477a59