feat(mocked-compass): add mocked compass package COMPASS-8537

[lerouxb]

I have this as a draft for now because I'm still deciding if I should wire it up in CI in this same PR or do that in a separate one. We'd have to spawn the signing server like we do for the package tasks so that the file will be signed, for example.

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This builds a minimal electron app that doesn't even open a window, so there's just a main process. Running the app it made then produces a file ready.signal containing the text Hello from a future Compass! and it exits.

In a future PR we can build this from the smoketests task, then serve up this file from the fake auto-update webserver we'd already be running. The test can check for the ready.signal file to make sure that auto-update worked.

~/mongo/compass/packages/mocked-compass % time HADRON_DISTRIBUTION=compass npm run package-compass
[snip]
✔ hadron-build:release 3 assets successfully built
ℹ hadron-build:release /Users/leroux.bodenstein/mongo/compass/packages/mocked-compass/dist/mongodb-compass-99.0.0-darwin-arm64.dmg
ℹ hadron-build:release /Users/leroux.bodenstein/mongo/compass/packages/mocked-compass/dist/mongodb-compass-99.0.0-darwin-arm64.zip
ℹ hadron-build:release /Users/leroux.bodenstein/mongo/compass/packages/mocked-compass/dist/mongodb-compass-99.0.0-darwin-arm64.zip.sig
HADRON_DISTRIBUTION=compass npm run package-compass  24.24s user 4.69s system 155% cpu 18.654 total