[8.6] updated codeowners

[juliaElastic]

Updated codeowners as done in main: https://github.com/elastic/fleet-server/blob/main/.github/CODEOWNERS

Currently this prevents me from merging a backport pr: #2110

[cmacknz]

May be easier to rely on the label driven backport automation with #2112 than manually duplicating this into every branch. Add backport-v8.6 on #2112 should automatically create a PR against the 8.6 branch once the original PR is merged.

[elasticmachine]

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