Refactor the DAG application logic into Graph

[jonathan-innis]

• Refactors the application logic that was passed to the individual workflows into the DAG graph creation
• Template Generation no longer has the complex subchart application logic

[nitishm]

Overall LGTM - address the unit tests CI failures and we should be good to merge this in.

[codecov-commenter]

Codecov Report

Merging #371 (d8d4feb) into main (3989de1) will increase coverage by 2.34%. The diff coverage is 74.50%.

@@            Coverage Diff             @@
##             main     #371      +/-   ##
==========================================
+ Coverage   29.70%   32.04%   +2.34%     
==========================================
  Files          13       13              
  Lines         707      596     -111     
==========================================
- Hits          210      191      -19     
+ Misses        487      398      -89     
+ Partials       10        7       -3     

Impacted Files	Coverage Δ
pkg/workflow/workflow.go	0.00% <ø> (ø)
pkg/workflow/workflow_forward.go	0.00% <0.00%> (ø)
pkg/workflow/workflow_reverse.go	0.00% <0.00%> (ø)
pkg/workflow/workflow_rollback.go	0.00% <0.00%> (ø)
pkg/workflow/templates.go	81.25% <68.57%> (-2.20%)	:arrow_down:
pkg/workflow/graph.go	92.98% <92.85%> (+82.02%)	:arrow_up:
controllers/appgroup_controller.go	73.23% <0.00%> (-4.23%)	:arrow_down:

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