DOC: pre-release notes

docs/source/upcoming_release_notes/104-parametrize_filestore_backend_fixture.rst

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+104 parametrize filestore backend fixture
+#################
+
+API Breaks
+----------
+- the filestore_backend fixture requires parametrization using 'db/filestore.json' to match prior behaviour
+- the linac_data fixture returns a Root rather than a tuple of Entries
+- the comparison_linac_snapshot fixture has been renamed, and returns a Root containing the entries from linac_data in addition to its comparison snapshot
+
+Features
+--------
+- make the filestore_backend fixture accept pytest parametrized args
+- args can be a file path, functions that return a Root or Iterable[Entry], or function names resolvable in conftest.py
+
+Bugfixes
+--------
+- N/A
+
+Maintenance
+-----------
+- N/A
+
+Contributors
+------------
+- shilorigins