feat: Implement setting uid and groups for renderer process OS-17053

[t-bashir-bs]

Description of Change

Cherry picked changes from QTWebEngine to allow setting the uid and groups
for the renderer process. This is needed to allow the renderer process to
run as a different user and group than the main process.

The parameters are passed via switches --renderer-process-uid and
--renderer-process-gids. A safety check has been added to ensure the
renderer process is not run as root.

Checklist

• PR description included and stakeholders cc'd
• npm test passes
• tests are changed or added
• relevant documentation, tutorials, templates and examples are changed or added
• PR release notes describe the change in a way relevant to app developers, and are capitalized, punctuated, and past tense.

Release Notes

Notes:

[caneraltinbasak]

Can you try doing the same on preload scripts using process.args and process.setuid, process setgid? If that works, we won't need to modify Chromium source.

[t-bashir-bs]

Can you try doing the same on preload scripts using process.args and process.setuid, process setgid? If that works, we won't need to modify Chromium source.

I tried this but unfortunately only the reduced subset of node process is available:
https://www.electronjs.org/docs/latest/api/process