fix broken links to testgrid dashboard

[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

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: anshikavashistha / name: Anshika Vashistha (4ce6860)

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[k8s-ci-robot]

Hi @anshikavashistha. Thanks for your PR.

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[dpasiukevich]

/lgtm
/approve

Thanks for the PR!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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