* Update release notes to include 8.7.0
Release notes and migration guide from 8.7.0 release ported into main
as well as re-generating 8.8.0 release notes. This latter step will
be overwritten anyway, multiple times, by more up-to-date regeneration
of the 8.8.0 release notes during the release process.
* Remove coming 8.7.0 line
* Update docs/reference/migration/migrate_8_7.asciidoc
Co-authored-by: Abdon Pijpelink <abdon.pijpelink@elastic.co>
* Make same change to 8.8
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Co-authored-by: Abdon Pijpelink <abdon.pijpelink@elastic.co>
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