docs: fix broken GKE setup link

[leno23]

Changes

• replace the broken Knative GKE setup link in DEVELOPMENT.md with the current Google Cloud GKE quickstart

Fixes #1914

Validation

• verified the replacement link returns HTTP 200

[linux-foundation-easycla]

• ❌ The email address for the commit (4e767bc) is not linked to the GitHub account, preventing the EasyCLA check. Consult this Help Article and GitHub Help to resolve. (To view the commit's email address, add .patch at the end of this PR page's URL.) For further assistance with EasyCLA, please visit our EasyCLA portal and chat with our support bot.

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[anithapriyanatarajan]

@leno23 Thank you for the contribution! A couple of things to address before this can be merged:

1. EasyCLA: The CLA check is failing because the email on commit 4e767bc isn't linked to your GitHub account. Please sign the EasyCLA and ensure your commit email matches your GitHub account — see the Tekton community CLA process and the GitHub help article for guidance.

2. Scope of the fix: A simple link redirect to the generic GKE quickstart may not be sufficient here. The original link pointed to Knative-with-GKE.md, which captured a specific set of pre-requisite tooling (e.g. kubectl, gcloud, etc.) tailored to the Tekton operator setup. The current replacement doesn't cover those prerequisites. We should revisit what the right target content is, this likely warrants updating the DEVELOPMENT.md section itself rather than just swapping the URL.

[anithapriyanatarajan]

/release-note-none

[anithapriyanatarajan]

/hold