Make gradle test run verifyMigrationTask instead of check

[joshfriend]

This matches what the docs say and wires things up automatically for anyone who doesn't use the check task directly.

... a new verifySqlDelightMigration task will be added to the gradle project, and it will run as part of the test task ...

https://cashapp.github.io/sqldelight/2.0.0/multiplatform_sqlite/migrations/#verifying-migrations

[JakeWharton]

test is a language-specific task that is not guaranteed to be present. On the JVM it's a real task. In Kotlin multiplatform it's an aggregating task. But it requires that there be a language plugin to provide it.

check, on the other hand, is a lifecycle task that will always be present: https://docs.gradle.org/current/userguide/base_plugin.html#sec:base_tasks. The docs are basically calling out our specific use case:

Plugins and build authors should attach their verification tasks

I think we should fix the docs, not change the code.

[joshfriend]

I think we should fix the docs, not change the code.

Sure, updated!

[JakeWharton]

Thanks!