Fix OOM on Eclipse CI / Fix Github Workflows

[jfaltermeier]

What it does

• set NODE_OPTIONS globally
• add webpack config to prevent Terser from running in parallel
  • each spawned worker would have the whole memory available again, which will lead to the build not running oom
• use npm registry instead of yarn registry, since this seems to work more reliable on the windows build node
• disable lint header check for files without MIT license
  • header check tries to enforce MIT license
• Fix path to windows AUT
• Fix path to mac main script

Contributed on behalf of STMicroelectronics

How to test

Build should work in low memory environments, like Eclipse CI (see https://ci.eclipse.org/theia/job/TheiaCDTCloudTest/job/jf%252Fmemory/9/)

Github Workflows on this PR should work

• downloading plugins may sometimes fail leading to test errors

[sdirix]

Very nice, thank you!