ci: remove the --no-package-lock tests (#5940)

These exist to test against fully updated dependencies and transitive dependencies, but
this means that builds are not reproducible and even main can suddenly start failing
without any code changes. Plus, Renovate is already our blessed, more controlled solution
for this.

Author: serhalp

.github/workflows/workflow.yml

@@ -148,29 +148,6 @@ jobs:
             node-version: '14.16.0'
             install-command: npm ci
             machine: '4'
-          # The buildbot pins Netlify Build's dependencies, like `npm ci`.
-          # But other consumers do not, like `npm install`.
-          # So we test both.
-          - os: ubuntu-latest
-            node-version: '*'
-            install-command: npm install --no-package-lock
-            machine: '0'
-          - os: ubuntu-latest
-            node-version: '*'
-            install-command: npm install --no-package-lock
-            machine: '1'
-          - os: ubuntu-latest
-            node-version: '*'
-            install-command: npm install --no-package-lock
-            machine: '2'
-          - os: ubuntu-latest
-            node-version: '*'
-            install-command: npm install --no-package-lock
-            machine: '3'
-          - os: ubuntu-latest
-            node-version: '*'
-            install-command: npm install --no-package-lock
-            machine: '4'
       fail-fast: false
     steps:
       # Sets an output parameter if this is a release PR