fix(engine): disable config modification (#439)

Description

Rename allowModifyingConfig to disableConfigModification

Related issue

#439 (closed)

Examples

server:
  verificationToken: "token"
  port: 2345

  # Deny modifying configuration via UI/API. Default: false.
  disableConfigModification: true

Status response

{
  "status": {
    "code": "OK",
    "message": "Instance is ready"
  },
  "engine": {
    "version": "v3.2.0-37-g59d93f3-20221104-0123",
    "edition": "community",
    "startedAt": "2022-11-04T01:32:14Z",
    "telemetry": true,
    "disableConfigModification": true
  },
...

Checklist

• MR description has been reviewed
• MR changes are functionally tested
• MR does NOT have API/CLI changes OR there are API/CLI changes and they have been reviewed & DOCS ARE ADJUSTED (reference doc, etc)
• MR does NOT have UI changes OR there are UI changes and they have been reviewed & UX IS REVIEWED

Closes #439 (closed)