feat: Add 'outputs.result' to Container templates

[simster7]

Closes #2530

[codecov]

Codecov Report

Merging #2584 into master will increase coverage by 0.02%.
The diff coverage is 41.47%.

@@            Coverage Diff             @@
##           master    #2584      +/-   ##
==========================================
+ Coverage   11.14%   11.16%   +0.02%     
==========================================
  Files          83       83              
  Lines       32652    32673      +21     
==========================================
+ Hits         3640     3649       +9     
- Misses      28514    28525      +11     
- Partials      498      499       +1     

Impacted Files	Coverage Δ
persist/sqldb/migrate.go	0.00% <0.00%> (ø)
...rkflow/v1alpha1/cluster_workflow_template_types.go	0.00% <0.00%> (ø)
.../apis/workflow/v1alpha1/workflow_template_types.go	40.00% <0.00%> (ø)
pkg/apis/workflow/v1alpha1/workflow_types.go	10.90% <0.00%> (ø)
workflow/common/util.go	7.29% <0.00%> (ø)
workflow/controller/workflowpod.go	70.74% <ø> (ø)
workflow/executor/executor.go	4.37% <0.00%> (-0.04%)	⬇️
workflow/controller/dag.go	50.61% <33.33%> (ø)
workflow/controller/steps.go	64.89% <42.85%> (ø)
workflow/templateresolution/context.go	65.18% <48.93%> (ø)
... and 7 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 51bc876...d9716a7. Read the comment docs.

[alexec]

@sarabala1979 I think your area?