GraphQL - Variables flow

[Monika-APM]

Description : In this, user should be able to switch to the variables tab & can add the variables as per the requirement.

Figma/SS :

Acceptance criteria 1: [Variables flow]
Given User wants to add variables
When User adds variables in the variables section
Then User should be able to add the variables & the variables should be saved in backend as well.

Note: Rest all functionality will remain same as previous.