add deployonly type

[GwonsooLee]

Description

We add a new replacement type DeployOnly. This can be used when there is no health check process like bastion server, sample test service for local development, etc.

With DeployOnly type, goployer will skip healthcheck process. It will provision a new version of autoscaling and delete the previous versions right away. It still checks whether all instances are successfully terminated.

Follow-up Work (remove if N/A) Add end to end test code for deployonly type

[codecov[bot]]

Codecov Report

Merging #130 (11d2e5d) into main (8ba3fe3) will decrease coverage by 0.13%. The diff coverage is 2.15%.

@@           Coverage Diff            @@
##            main    #130      +/-   ##
========================================
- Coverage   4.96%   4.83%   -0.14%     
========================================
  Files         28      29       +1     
  Lines       4630    4718      +88     
========================================
- Hits         230     228       -2     
- Misses      4388    4478      +90     
  Partials      12      12              

Impacted Files	Coverage Δ
pkg/aws/elbv2.go	0.00% <0.00%> (ø)
pkg/constants/constants.go	66.66% <ø> (ø)
pkg/deployer/canary.go	1.23% <0.00%> (-0.01%)	:arrow_down:
pkg/deployer/deployonly.go	0.00% <0.00%> (ø)
pkg/runner/runner.go	4.40% <0.00%> (-0.03%)	:arrow_down:
pkg/deployer/deployer.go	1.20% <25.00%> (-0.28%)	:arrow_down:

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