Remove remaining ActiveRecord deprecations

Grammar linting in activerecord/CHANGELOG.md

[ci skip]

Fix grammar in AR CHANGELOG.md [ci skip]

Remove all ActiveRecord deprecations

Sync the visibility of `sql_for_insert` to private

fix with_routing test helper to make it work with api-only controllers

[ *Kasper Timm Hansen* & *Kir Shatrov* ]

We try to not try! internally.

Make ActiveRecord structure load/dump configurable

Update list of `duplicable?` objects in AS core_ext guide [ci skip]

use Thor option parser in server commands parse

Use `next` instead of `break`; avoid terminating whole loop

We want to avoid terminating the whole loop here, because it will cause
parameters that should be removed to not be removed, since we are
terminating early. In this specific case, `param2` is processed before
`param1` due to the reversing of `route.parts`, and since `param2` fails
the check on this line, it would previously cause the whole loop to
fail, and `param1` would still be in `parameterized_parts`. Now, we are
simply calling `next`, which is the intended behavior.

Introduced by 8ca8a2d7.

Fixes #27454.