docs: Updated quickstart to use stable Istio release 1.28.0

[AtharvaPakade]

What type of PR is this?
/kind documentation

What this PR does / why we need it:
This PR updates the quickstart guides to use the stable Istio release version 1.28.0, ensuring that users are running on a stable and fully supported version of Istio.

Which issue(s) this PR fixes:
Fixes #1856

Does this PR introduce a user-facing change?:

NONE

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[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: atharva-310 / name: Atharva Pakade (c1dd1f5)

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @atharva-310. Thanks for your PR.

I'm waiting for a github.com member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[nirrozenbaum]

/ok-to-test

[shmuelk]

@atharva-310 Your changes look great now. Please make sure that all of your commits are signed and verified

[nirrozenbaum]

/approve

leaving final stamp for @shmuelk

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: atharva-310, nirrozenbaum

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[shmuelk]

/lgtm