Added unit tests to lifecycle

[NeerajNagure]

What type of PR is this?

/kind feature

What this PR does / why we need it:

This PR adds unit tests to lifecycle_test.go for several functions like ListAllPossibleStages from lifecycle,LifecycleMatch,StageMatch,StageDelay

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

NONE