adding variable replicas in k8s script files

[demon-36]

Adding a variable for no. of replicas in k8s scripts

Description

Currently k8s scripts of Bassa don't have variable replicas , so this variable is added and have given values, for bassa-api.yaml : replicas: 2 & bassa-ui.yaml : replicas: 1

Related Issue

#751

Motivation and Context

This will help to decide no. of clusters from k8s environment running for that particular service

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

[demon-36]

@vivonk @agentmilindu plz have a look ;)