[Epic] Release notes

[patiencedaur]

Start the operational work around March 1.

Total: 29pt

Related dev. epic: https://github.com/tarantool/roadmap-internal/issues/69
SME: @ Totktonada

Process document to be updated: https://www.notion.so/tarantool/WIP-Release-notes-workflow-b4292dbf8fbd41d58a1983546de4a879

Writing

• Compatibility guarantees for updating Tarantool #2218
• Add releases lifetime table #1025
• [2pt] Update the Major features page #2571
• [Eternal] Proofread Tarantool changelogs for 2.10.0-rc1 tarantool#6430
• Add changelog for 2.10.0- beta2 #2824
• [0pt] Automate changelog review tracking #2544

Guidelines & process

• [5pt] Describe English style to use in release notes #2111
• [8pt] Improve release notes: workflow and user experience #1285

Related technical debt

Not an actual part of the epic, but relevant.
See #2572

[patiencedaur]

Only changelog proofreading remains. It is performed each week until the changelog (and the release) is published. Closing the epic because there is nothing more to track here.