Upgraded istio to v1.19.10

[biswajit-9776]

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✏️ A brief description of the changes

I upgraded istio from version 1.18.7 to 1.19.10

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[juliusvonkohout]

Please also fix the Readme based on your experience with the upgrade for istio and istio-cni in this PR.

[juliusvonkohout]

/ok-to-test

[biswajit-9776]

Let me upgrade istio-cni and push it in this same PR.

[biswajit-9776]

I pushed this PR with two scripts which I think could push after the v1.22.0 upgradation.

[juliusvonkohout]

I pushed this PR with two scripts which I think could push after the v1.22.0 upgradation.

I do not see the two scripts in /hack
Please add them in the next PR

/lgtm
/approve

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This pull-request has been approved by: juliusvonkohout

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[biswajit-9776]

Yes I will push the two scripts in the upcoming PRs.