Unifying Chaos Experiment Runs status to enum

[namkyu1999]

We already have the ChaosExperimentRunStatus enum like below.

litmus/chaoscenter/graphql/definitions/shared/chaos_experiment.graphqls

Lines 23 to 33 in 399af62

	enum ExperimentRunStatus {
	All
	Running
	Completed
	Completed_With_Error
	Stopped
	Skipped
	Error
	Timeout
	NA
	}

But our code base uses plain string, not an enum. That makes it difficult to make changes to the code.

e.g.

1. There's no Queued state in our enum.
   

   litmus/chaoscenter/graphql/server/pkg/chaos_experiment_run/handler/handler.go

   Lines 856 to 859 in 399af62

   	err = c.chaosExperimentRunOperator.CreateExperimentRun(sessionContext, dbChaosExperimentRun.ChaosExperimentRun{
   	InfraID: workflow.InfraID,
   	ExperimentID: workflow.ExperimentID,
   	Phase: "Queued",

2. There's a difference between our enum and other code
   

   litmus/chaoscenter/graphql/server/pkg/chaos_experiment_run/handler/handler.go

   Lines 1045 to 1051 in 399af62

   	resMap := map[string]int{
   	"Completed": 0,
   	"Stopped": 0,
   	"Running": 0,
   	"Terminated": 0,
   	"Error": 0,
   	}

Also, I cannot find docs about Chaos Experiment status & Chaos Experiment Run status.

So, We need to implement two things.

1. Unifying Chaos Experiment Runs status to enum
2. Add docs about Chaos Experiment status & Chaos Experiment Run status

Let me know if I'm misinterpreting. If I'm on the right track, I'll get started or assign the task to the LFX mentee.

[Saranya-jena]

@amityt Can you take a look at this?

[amityt]

Sure @Saranya-jena I will take this up! Thanks for pointing this out @namkyu1999