(core) remove metrics

Summary: This removes some old metric code. There's also a user preference dialog that has a single option (whether to allow metrics) this is left in place with a dummy option. It could be ripped out as well, probably.

Test Plan: existing tests pass

Reviewers: dsagal

Reviewed By: dsagal

Differential Revision: https://phab.getgrist.com/D2622

app/server/devServerMain.ts

@@ -70,7 +70,6 @@ export async function main() {
     const fileName = path.join(instDir, 'config.json');
     if (!(await fse.pathExists(fileName))) {
       const config = {
-        enableMetrics: false,
         untrustedContentOrigin: 'notset',
       };
       await fse.writeFile(fileName, JSON.stringify(config, null, 2));