Add changelog entry

Author: agustinmista

ouroboros-consensus/changelog.d/20251124_140035_agustin.mista_improve_chaindb_qsm_tests.md

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+<!--
+A new scriv changelog fragment.
+
+Uncomment the section that is right (remove the HTML comment wrapper).
+For top level release notes, leave all the headers commented out.
+-->
+
+<!--
+### Patch
+
+- A bullet item for the Patch category.
+
+-->
+### Non-Breaking
+
+- Allow generating k>2 in ChainDB state machine tests on the fly.
+- Improve chances of switching to a shorter chain in ChainDB state machine tests.
+
+<!--
+### Breaking
+
+- A bullet item for the Breaking category.
+
+-->