EV-4811 Upgrade elasticsearch and kibana to version 8

[vara2504]

https://tigera.atlassian.net/browse/EV-4811

Upgrading elasticsearch and kibana to version 8 in 3.21 ep 1 for enterprise.
We have no cloud changes, since elastic is maintained by the our cloud team.

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• A member of the docs team has approved this change.

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• Deploy preview inspected wherever changes were made
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Lighthouse	1 paths audited Performance: 26 (🔴 down 1 from production) Accessibility: 90 (no change from production) Best Practices: 83 (no change from production) SEO: 92 (no change from production) PWA: - View the detailed breakdown and full score reports

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[vara2504]

@hjiawei @ctauchen Can i get a review on this minor change