[jnasbyupgrade]

Stamps HISTORY.asc for 2.4.0. This PR should be merged normally.

The stamp commit also adds two STABLE entries that were missing (test-build now actually running before the main suite, and PGXNTOOL_ENABLE_TEST_INSTALL=yes erroring on an empty test/install/), orders the 2.4.0 entries by importance, and groups them under Breaking changes / Behavior changes / New features / Bug fixes subsections.

Companion PR (must NOT be merged; exists only to trigger a real CI test run): Postgres-Extensions/pgxntool-test#103

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