Migration of broken links

[anshikavashistha]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Fixes a broken link to testgrid dashboard in README.md

Which issue(s) this PR fixes:

This is related to an umbrella issue and fixes a task of the same:
kubernetes/test-infra#30370

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @anshikavashistha. Thanks for your PR.

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[rjbez17]

/ok-to-test
/lgtm

[rjbez17]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: anshikavashistha, rjbez17

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