Upgrade to Nx 15.9.1

[gabalafou]

This PR can somewhat be thought of as a re-opening of closed PR #723.

I wanted to go straight to the latest Nx version (17) but it was too much work. This will hopefully provide a stepping stone to future upgrades.

The process to create this PR looked something like:

git checkout develop
git pull
git checkout -b 15-9
nx migrate 15.9.1
git commit
npm install --force
git commit
# make some changes to package.json
git commit
npm install
git commit
# add .nx/cache to .gitignore
nx migrate --run-migrations --create-commits

Then I cherry picked a bunch of commits from #723.

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Name	Status	Preview	Comments	Updated (UTC)
labs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 12, 2023 4:07pm

[gabalafou]

Note the following commands run without errors locally:

nx serve labs
nx lint labs
nx test labs

The same commands except test also worked for consulting. nx test consulting produces an error about fetch not being available globally. The error is thrown by the Apollo client constructor. It's puzzling to me because fetch has been a global in Node.js since v18.

Nonetheless, I get the same error on develop when I run nx test consulting so it shouldn't hold back this PR.