Add multi-approval support

[rvandernoort]

Summary

Replace Suspend/Resume with modified parameter process of approval with an actual account related approval form.
Proposal for argoproj#12108

Use Cases

Approving promotion from various environments, but need multi Ops approval before promotion.

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Functions:

• Get local development to work
• Create Approvers list as part of parameters of suspend
  • pkg/apis/workflow/v1alpha1/workflow_types.go
  • Create arguments/parameters for each reviewer (state of review)
  • Check if approvers list == reviewed list otherwise requeue else continue
  • Connect it with actual user accounts using email
  • (optional) make groups work
• Replace GUI Modify parameters with Approvers list
  • ui/src/app/workflows/components/workflow-details/suspend-inputs.tsx
  • Show approval status of all accounts (highlight your own account)
  • Allow approval from your account if that is declared
  • Save approval for your account
  • Check if approval is over threshold and merge otherwise
  • Change when clause which now depends on the variable (switch to approval amount out of list)
    • (optional) more advanced options
• (optional) cli support?
• allow both approval and parameter in conjunction.

TODO

• docs
• tests
• add minimal required approvals
• fix approvals count (current/required)
• save approval

[rvandernoort]

Short-term: use plugin style instead of directly in core.

[rvandernoort]

As were not plannig to use argo workflows in the near future for now: maybe move this to the IceBox @elwin1234

[elwin1234]

Good point