Restore leaving developer mode warning dialog

[Steve-Mcl]

closes #2875

Description

Show user a warning when exiting developer mode.

• Pressing cancel keeps the device in developer mode
• Pressing confirm proceeds with the mode switch

👆 NOTE: GIF text is outdated 👆
Text now reads:

Disabling developer mode will turn off access to the editor and
may redeploy the current target snapshot to the device.

Any changes made to the device whilst in developer mode will be lost.

To avoid losses, you can cancel this operation and create a snapshot
in the developer mode tab.

dialog text is almost identical to original dialog prior to the toggle button removing it (with a slight tweak)

Related Issue(s)

#2875

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

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

[Steve-Mcl]

OMG Cypress tests - WOW! 2 hours for something that should have taken 10 mins

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (d01964b) 40.36% compared to head (7da31a1) 40.74%.
Report is 109 commits behind head on main.

Files	Patch %	Lines
...rc/pages/device/components/DeveloperModeToggle.vue	0.00%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3251      +/-   ##
==========================================
+ Coverage   40.36%   40.74%   +0.38%     
==========================================
  Files         592      603      +11     
  Lines       21667    22527     +860     
  Branches     5214     5444     +230     
==========================================
+ Hits         8746     9179     +433     
- Misses      12921    13348     +427     

Flag	Coverage Δ
backend	77.54% <ø> (+0.62%)	⬆️
frontend	2.01% <0.00%> (+0.07%)	⬆️

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