Add Device Group env vars API support

[Steve-Mcl]

closes #4658

Description

Route added

• PUT /api/v1/applications/:applicationId/device-groups/:groupId/settings
  • Expects body to contain an env array of objects

NOTE: Adding endpoint vs updating the PUT /api/v1/applications/:applicationId/device-groups/:groupId route
was a toss of a coin. Instances overload the PUT /api/v1/projects/:id route allowing for the
settings to be updated in the same request. However, devices have a separate route PUT /api/v1/devices/:deviceId route.
Since devices and device groups are closer in relation, I decided to follow suit. I did however structure this is a way that we can easily remove this endpoint and map the feature to the existing route if so desired

Specified behaviour

• Only an owner role user can update the group settings
  • The RBAC application:device-group:update permission was re-used for this purpose
• The env array of objects is merged with the existing member devices only in the live API (when a device is requesting settings)
• Updating a device group model settings and saving will trigger all member devices to update their settings hash
• When the hash is computed, group env vars are merged with the device env vars before computing the hash (they are not persisted in the device model)

Tests added

  Audit Log > Application
    ✔ Provides a logger for updating device group settings

  Application Device Groups API
    Update Device Settings
      ✔ Owner can update a device group settings (414ms)
      ✔ Merges new Group Env Var (351ms)
      ✔ Only updates a device settings hash if the group env var change affects the merged settings env (327ms)
      ✔ Member can not update a device group settings (403) (95ms)
      ✔ Non Member can not update a device group settings (404) (95ms)

Related Issue(s)

Owner: #4658
Parent: #4538

Checklist

• I have read the contribution guidelines
• Suitable unit/system level tests have been added and they pass
• Documentation has been updated
  • Upgrade instructions
  • Configuration details
  • Concepts
• Changes flowforge.yml?
  • Issue/PR raised on FlowFuse/helm to update ConfigMap Template
  • Issue/PR raised on FlowFuse/CloudProject to update values for Staging/Production

Labels

• Includes a DB migration? -> add the area:migration label

[codecov]

Codecov Report

Attention: Patch coverage is 93.45794% with 7 lines in your changes missing coverage. Please review.

Project coverage is 78.59%. Comparing base (49321fc) to head (6bf7127).
Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
forge/ee/db/controllers/DeviceGroup.js	83.33%	3 Missing ⚠️
forge/ee/routes/applicationDeviceGroups/index.js	91.30%	2 Missing ⚠️
...rations/20241016-01-add-settings-to-devicegroup.js	80.00%	1 Missing ⚠️
forge/db/models/DeviceGroup.js	97.77%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4659      +/-   ##
==========================================
+ Coverage   78.53%   78.59%   +0.06%     
==========================================
  Files         303      304       +1     
  Lines       14398    14470      +72     
  Branches     3285     3303      +18     
==========================================
+ Hits        11307    11373      +66     
- Misses       3091     3097       +6     

Flag	Coverage Δ
backend	78.59% <93.45%> (+0.06%)	⬆️

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