set up 8.11 release cycle

[pzl]

Change Summary

• updates min. kibana to ^8.11 (this will cause CI to fail as 8.11 docker images don't exist, which is OK)
• updates package to 8.11.0-preview. The package linter doesn't accept -dev as a valid suffix
• adds matching TBD changelog line, which also quiets the linter

[elasticmachine]

💔 Build Failed

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Build stats

• Start Time: 2023-08-14T18:26:31.465+0000

• Duration: 6 min 53 sec

Steps errors

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Update the Elastic stack

• Took 0 min 13 sec . View more details here
• Description: ./scripts/go-tools/bin/elastic-package stack update -v --version 8.11.0

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