Reason for cancellation

[carlocamurri]

Based on #2438

• Ensures message is max 512 chars long
• Fixes UI styling
• Ensures reason is populated in JobCancelled event
• Add tests
• Ensures cancellation reason is not stored in Redis

[codecov]

Codecov Report

Patch coverage: 46.66% and project coverage change: -0.03 ⚠️

Comparison is base (ed0ecaf) 58.47% compared to head (109eac6) 58.44%.

❗ Current head 109eac6 differs from pull request most recent head 739a9e8. Consider uploading reports for the commit 739a9e8 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2470      +/-   ##
==========================================
- Coverage   58.47%   58.44%   -0.03%     
==========================================
  Files         235      235              
  Lines       29464    29521      +57     
==========================================
+ Hits        17230    17255      +25     
- Misses      10913    10947      +34     
+ Partials     1321     1319       -2     

Flag	Coverage Δ
armada-server	58.44% <46.66%> (-0.03%)	⬇️

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

Impacted Files	Coverage Δ
internal/armada/server/submit_from_log.go	4.19% <0.00%> (-0.22%)	⬇️
internal/armada/server/submit_to_log.go	0.00% <0.00%> (ø)
internal/common/eventutil/eventutil.go	38.15% <0.00%> (-0.04%)	⬇️
internal/armada/server/submit.go	55.89% <80.00%> (+0.40%)	⬆️
internal/armada/server/reporting.go	64.34% <100.00%> (+0.47%)	⬆️
internal/common/util/batch.go	100.00% <100.00%> (ø)
internal/eventingester/convert/conversions.go	69.64% <100.00%> (+9.17%)	⬆️
...nal/lookoutingesterv2/instructions/instructions.go	75.31% <100.00%> (+0.41%)	⬆️
internal/lookoutingesterv2/lookoutdb/insertion.go	85.08% <100.00%> (+0.12%)	⬆️
internal/lookoutv2/conversions/convert.go	95.38% <100.00%> (+0.07%)	⬆️
... and 1 more

... and 8 files with indirect coverage changes

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