Expose saving of YAML templates and hide the legacy UI

[kalikiana]

• Expose Save button in the UI
• Hide legacy UI when YAML is/was stored
• Handle conflicts via the reference feature (no diff here, just a simple error)

Prerequisite: #2103

Fixes: poo#54146

[Martchus]

The tests don't pass yet and I haven't tested it locally yet. But judging from the code it looks already good.

[okurz]

Could you deploy that to our staging instances?

[codecov]

Codecov Report

Merging #2111 into master will increase coverage by 0.1%.
The diff coverage is 95%.

@@            Coverage Diff            @@
##           master    #2111     +/-   ##
=========================================
+ Coverage   83.35%   83.46%   +0.1%     
=========================================
  Files         170      170             
  Lines       10618    10626      +8     
=========================================
+ Hits         8851     8869     +18     
+ Misses       1767     1757     -10

Impacted Files	Coverage Δ
lib/OpenQA/WebSockets/Controller/Worker.pm	98.19% <100%> (+0.85%)	⬆️
lib/OpenQA/WebAPI/Controller/API/V1/JobTemplate.pm	94% <94.73%> (+0.66%)	⬆️
lib/OpenQA/Scheduler/Model/Jobs.pm	88.88% <0%> (+2.77%)	⬆️
lib/OpenQA/WebSockets.pm	92.75% <0%> (+4.34%)	⬆️

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[Martchus]

Before we allow users to save YAML (and add parameters) dump_templates and load_templates should support them (or at least just ignore them).

[codecov]

Codecov Report

Merging #2111 into master will decrease coverage by 0.06%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2111      +/-   ##
==========================================
- Coverage   85.92%   85.86%   -0.07%     
==========================================
  Files         164      164              
  Lines       10803    10805       +2     
==========================================
- Hits         9283     9278       -5     
- Misses       1520     1527       +7

Impacted Files	Coverage Δ
lib/OpenQA/WebAPI/Controller/API/V1/JobTemplate.pm	93.86% <100%> (+0.04%)	⬆️
lib/OpenQA/Worker/Settings.pm	84.31% <0%> (-13.73%)	⬇️

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