Add support for httpNodeAuth settings on devices

[knolleary]

Part of #5014

Note: do not merge until Device Agent 3.1 has been published

Description

Adds the HTTP Node security settings to the Device settings page.

This reuses the Instance template page for node security.

Includes a banner warning if the Device Agent version is unknown, or too old to support the settings. However, I did chose to allow the settings to be saved in those cases. (Note banner at top, which is repeated above the Save button, just to be sure).

---

To support FF Auth on devices, we now generate an AuthClient whenever the device calls home to get its settings. That happens whenever the device is notified the settings have been changed. The auth client details are only needed when establishing a login session - changing the client details doesn't invalidate existing sessions.

I did have to update oauth.js which assumed the AuthClient owner was an Instance - but it can now be a device.

Will link to the companion Device Agent PR once it is available.

---

• Add some tests

[codecov]

Codecov Report

Attention: Patch coverage is 88.67925% with 6 lines in your changes missing coverage. Please review.

Project coverage is 78.45%. Comparing base (4528ec2) to head (64de97b).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
forge/routes/auth/oauth.js	72.72%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5068      +/-   ##
==========================================
+ Coverage   78.40%   78.45%   +0.04%     
==========================================
  Files         329      329              
  Lines       15501    15546      +45     
  Branches     3582     3598      +16     
==========================================
+ Hits        12154    12197      +43     
- Misses       3347     3349       +2     

Flag	Coverage Δ
backend	78.45% <88.67%> (+0.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[hardillb]

Tested and read through. Looks good.

Not merging as is dependent on 3.1 device agent. (reviewing next)