Add UI for Device Group Env Setup

[Steve-Mcl]

closes #4660

Description

• Re-arranges the Device Group settings into 2 sub-tabs of
  • General - this includes the original settings (like editing name/desc and deleting the device group)
  • Environment - this hosts the new Env Var editor for device groups
    • NOTE: As discussed in the issue, a warning was added near the save button to ensure users are aware that saving env changes could cause the member devices to restart
• Updates the TemplateSettingsEnvironment to permit helptext popup
  • The newly added Environment.vue uses this to explain the merge rules
• Updates audit log to properly render Device Group Settings Updated

Screenshots

Original settings section moved to "general" in new tabbed layout

New Environment Variables section in new tabbed layout

Info text

Unsaved changes

Demonstrating what happens if you have edited env vars but forgotten to save

Related Issue(s)

Owner: #4660
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

All modified and coverable lines are covered by tests ✅

Project coverage is 78.59%. Comparing base (6bf7127) to head (c93366e).
Report is 35 commits behind head on 4658-device-group-env-api.

Additional details and impacted files

@@                      Coverage Diff                      @@
##           4658-device-group-env-api    #4661      +/-   ##
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- Coverage                      78.59%   78.59%   -0.01%     
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  Files                            304      304              
  Lines                          14470    14469       -1     
  Branches                        3303     3303              
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- Hits                           11373    11372       -1     
  Misses                          3097     3097              

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[joepavitt]

Dialled down the note a little, as the "red" felt too much. I've also moved the banner to be above the "Save" button, and (I know this wasn't introduced here) made the "Save Settings" button larger.

[Steve-Mcl]

As this and the API branch are approved, I am merging this branch into the API feature branch for final CI test run and update before merge..