Generate dependencies per package build for Debian

[rzhao271]

This PR fixes #13089.

Instead of having a hardcoded list of dependencies, we now generate the list of dependencies for the Debian package on arm64, armhf, and amd64.

TODO before merge:

• CI tasks below pass (or, the failures are unrelated to this PR)
• PR is reviewed
• Package build CI is green
• Sanity test on a Debian VM and a Ubuntu VM

[rzhao271]

CI build f9c1be2209 is green

[rzhao271]

Debian CI run used to generate the dependencies: https://dev.azure.com/monacotools/Monaco/_build/results?buildId=166357&view=results

[rzhao271]

I've converted this PR to a draft because it turns out Electron isn't supposed to have a static dependency on libgdk-pixbuf-2.0-0, especially considering that that library has slightly different names between different versions of Ubuntu. We need to firstly get Electron to dynamically link that library instead.

[ChaseKnowlden]

Upstream PR is merged.

[ChaseKnowlden]

Can we change this PR to a regular pull request.

[rzhao271]

Remaining steps:

• Wait for Electron to release a new version with the fix
• Update VS Code to reference that new version of Electron
• Regenerate the dependencies and ensure libgdk-pixbuf doesn't show up in the deps list

[rzhao271]

The package is sane and there doesn't seem to be a libgdk-pixbuf package now.

[deepak1556]

Mostly LGTM, couple of style changes

[rzhao271]

Custom build CI passed.
I also did sanity testing yesterday and verified that the package can be installed on Ubuntu 16.04 and Debian 9 VMs.

[deepak1556]

Nice work!