Allow env var values to be hidden in UI

[cstns]

Description

Allows setting of hidden env vars, once set they can only be updated or removed

• applies to both remote and hosted instances
• duplicating hosted instances preserves varhidden state
• other limitations described in closes Set Env-vars to be hidden after creation #4835
• updated error logging and validation to include env vars names starting with numbers
• fixes validation recursion
• fixes removal of unsaved vars

Related Issue(s)

closes #4835

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 87.50000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 78.41%. Comparing base (0d5c9e1) to head (9d8b069).
Report is 37 commits behind head on main.

Files with missing lines	Patch %	Lines
forge/routes/api/project.js	66.66%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5043   +/-   ##
=======================================
  Coverage   78.41%   78.41%           
=======================================
  Files         329      329           
  Lines       15480    15494   +14     
  Branches     3574     3579    +5     
=======================================
+ Hits        12138    12150   +12     
- Misses       3342     3344    +2     

Flag	Coverage Δ
backend	78.41% <87.50%> (+<0.01%)	⬆️

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[knolleary]

@cstns can you add a screenshot of this in action? Helpful to see as part of the initial review, but can also be reused in changelog.

[cstns]

One thing that I should have probably done but can be added later on is to prompt an alert or make the user aware that once an env var is marked as hidden he can't make it visible again, only update it's value through the UI or possibly delete it.

I'll add a demo as well when done

[knolleary]

Doing some testing with a Device - any env var with a hidden value ends up blank on the device. I haven't dug through the whole PR yet, but this change may be to blame as its code that's reused when sending info on the env vars to the front end as well as down to the device.

[cstns]

but this change may be to blame as its code that's reused when sending info on the env vars to the front end as well as down to the device.

You are right, i'll move this to be filtered on the controller side. The same thing is happening to instance vars

[knolleary]

Verified its working properly now.

I'm wondering if the eye icon is clear enough as to what it does. Could we add a tooltip explaining its purpose?

[cstns]

can you take a quick look over 9d8b069?

[knolleary]

Looks good.