Fix broken links to testgrid dashboard

[dhruvmehtaaa]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
Fixes a broken link to testgrid dashboard in SIDECAR_RELEASE_PROCESS.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: dhruvmehtaaa / name: Dhruv Mehta (90c30b7)

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This pull-request has been approved by: dhruvmehtaaa
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