Update license headers / Format codes

[vdaas-ci]

Update license headers / Format Go codes and YAML files.

[vdaas-ci]

[CHATOPS:HELP] ChatOps commands.

• 🙆‍♀️ /approve - approve
• 💌 /changelog - add changelog comment
• 🍱 /format - format codes and add licenses
• ✅ /gen-test - generate test codes
• 🏷️ /label - add labels
• ⏪ /rebase - rebase master

[codecov]

Codecov Report

Merging #933 (a26417f) into master (5c914a2) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #933   +/-   ##
=======================================
  Coverage   16.31%   16.31%           
=======================================
  Files         469      469           
  Lines       23033    23033           
=======================================
  Hits         3758     3758           
+ Misses      19041    19040    -1     
- Partials      234      235    +1     

Impacted Files	Coverage Δ
internal/worker/queue.go	98.33% <0.00%> (-1.67%)	⬇️
internal/worker/worker.go	83.33% <0.00%> (ø)
internal/errgroup/group.go	93.93% <0.00%> (+1.51%)	⬆️

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