Avoid Blueprint schema formatting changes by build

[brandonpayton]

Motivation for the change, related issues

Every time we run npm run build, the Blueprint schema shows up as changed due to whitespace changes:

% git status
On branch trunk
Your branch is up to date with 'origin/trunk'.

Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
	modified:   packages/playground/blueprints/public/blueprint-schema.json

I guess this is because the generated schema is later auto-formatted by pre-commit hook here.

Implementation details

To avoid this, I updated the schema generator to format the JSON with our Prettier config as I guess the Nx-based formatter does. Now, after running npm run build there is no more distracting, undesired change to Blueprint schema.

Testing Instructions (or ideally a Blueprint)

• Run npm run build
• Observe there is no changed blueprint-schema.json file