Position riders before API teleportation

[lynxplay]

The previous teleportation logic would call Entity#positionRider for the
"teleportation" of passengers in the same dimension.
This prevented plugins that aggressively teleport entities on a per-tick
basis from allowing players to get out of sync with their vehicles as
the vanilla teleport logic simply performs a relative repositioning of
the passengers to the vehicle location.

The introduced diff now repositions the passengers onto their vehicle
before computing their relative offset and repositioning.

Resolves: #13239

[papermc-pr-publishing]

Last updated for: 23b3f022d6d51c90c3654f4f2d2f34a8ddf4c8d7.

Download the Paperclip jar for this pull request: paper-13342.zip

Maven Publication

The artifacts published by this PR:

• 📦 io.papermc.paper:dev-bundle:26.1.2.local-SNAPSHOT
• 📦 io.papermc.paper:paper-api:26.1.2.local-SNAPSHOT

Repository Declaration

In order to use the artifacts published by the PR, add the following repository to your buildscript:

repositories {
    maven("https://maven-prs.papermc.io/Paper/pr13342") {
        name = "Maven for PR #13342" // https://github.com/PaperMC/Paper/pull/13342
        mavenContent {
            includeModule("io.papermc.paper", "dev-bundle")
            includeModule("io.papermc.paper", "paper-api")
        }
    }
}