Added kubctl github action

[VenkataChalla554]

Context

Added kubectl action

Changes proposed in this pull request

Added kubctl  acrion can be refered by all pipelines

Guidance to review

Test Pipeline : https://github.com/DFE-Digital/publish-teacher-training/actions/runs/9091604641

Checklist

• [x] I have performed a self-review of my code, including formatting and typos
• [x] I have cleaned the commit history
• [x] I have added the Devops label
• [x] I have attached the pull request to the trello card

[VenkataChalla554]

Create setup-kubectl github action

[saliceti]

Can we add a README?

[VenkataChalla554]

Can we add a README?

Added README