Make projections production-ready

[alexey-milovidov]

Changelog category (leave one):

• Backward Incompatible Change

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Make projections production-ready. Add the optimize_use_projections setting to control whether the projections will be selected for SELECT queries. The setting allow_experimental_projection_optimization is obsolete and does nothing.

Note: it was supposed to make projections as non-experimental a long time ago, but the previous attempt was done with failure - the setting allow_experimental_projection_optimization was marked as obsolete but not obsoleted.

[robot-clickhouse]

This is an automated comment for commit 8a6e07f with description of existing statuses. It's updated for the latest CI running
The full report is available here
The overall status of the commit is 🔴 failure

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[azat]

By the way it could be marked as an alias for allow_experimental_projection_optimization (#45659)

[alexey-milovidov]

@azat I like the idea, please do it.

[azat]

#50044

Also this will allow to remove pr-backward-incompatible label I guess