Update litmus-portal to chaoscenter in kubectl apply github

[dusdjhyeon]

What this PR does / why we need it:

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

Special notes for your reviewer:

Checklist:

• [x] Fixes #272
• [x] Signed the commit for DCO to be passed
• [ ] Labelled this PR & related issue with documentation tag

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