refactor(core): Convert community-nodes support into a backend module

[netroy]

Summary

Related Linear tickets, Github issues, and Community forum posts

Review / Merge checklist

• PR title and summary are descriptive. (conventions)
• Docs updated or follow-up ticket created.
• Tests included.
• PR Labeled with release/backport (if the PR is an urgent fix that needs to be backported)

[codecov]

❌ 2 Tests Failed:

Tests completed	Failed	Passed	Skipped
5613	2	5611	0

View the top 2 failed test(s) by shortest run time

 should report community nodes

Stack Traces | 0.002s run time

Error: Expected test audit not to be an array
    at getRiskSection (.../integration/security-audit/utils.ts:23:9)
    at Object.<anonymous> (.../integration/security-audit/nodes-risk-reporter.test.ts:106:32)

 should report security settings

Stack Traces | 0.011s run time

Error: expect(received).toMatchObject(expected)

- Expected  - 1
+ Received  + 1

@@ -1,8 +1,8 @@
  Object {
    "features": Object {
-     "communityPackagesEnabled": true,
+     "communityPackagesEnabled": false,
      "publicApiEnabled": false,
      "templatesEnabled": true,
      "versionNotificationsEnabled": true,
    },
    "nodes": Object {
    at Object.<anonymous> (.../integration/security-audit/instance-risk-reporter.test.ts:252:27)
    at processTicksAndRejections (node:internal/process/task_queues:105:5)

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[ivov]

@netroy Thanks for working on this! I'm slowly modularizing community packages as I find the time using your work as reference, so this was definitely useful 🙏🏻