Enable towncrier

doc/changes/DM-28649.feature.rst

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+``pipetask qgraph`` can now generate a standalone "execution butler" which is a SQLite registry with all the expected outputs pre-filled in registry.  Using this registry allow ``pipetask run`` to execute without touching the main registry whilst still writing file artifacts to the standard location.  It is not yet configured to allow a completely detached processing using a local datastore but this can be changed manually after creation to use a chained datastore.

doc/changes/DM-29384.bugfix.rst

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+Improve exception handling in ``ExecFixupDataId``

doc/changes/DM-29580.bugfix.rst

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+Fix config comparison with ``--skip-existing``.

doc/changes/README.rst

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+Recording Changes
+=================
+
+This directory contains "news fragments" which are small files containing text that will be integrated into release notes.
+The files can be in restructured text format or plain text.
+
+Each file should be named like ``<JIRA TICKET>.<TYPE>`` with a file extension defining the markup format.
+The ``<TYPE>`` should be one of:
+
+* ``feature``: New feature
+* ``bugfix``: A bug fix.
+* ``api``: An API change.
+* ``perf``: A performance enhancement.
+* ``doc``: A documentation improvement.
+* ``removal``: An API removal or deprecation.
+* ``other``: Other Changes and Additions of interest to general users.
+* ``misc``: Changes that are of minor interest.
+
+An example file name would therefore look like ``DM-30291.misc.rst``.
+
+If the change concerns specifically the registry or a datastore the news fragment can be placed in the relevant subdirectory.
+
+You can test how the content will be integrated into the release notes by running ``towncrier --draft --version=V.vv``.
+``towncrier`` can be installed from PyPI or conda-forge.

pyproject.toml

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+[tool.towncrier]
+    package = "lsst.ctrl.mpexec"
+    package_dir = "python"
+    filename = "doc/lsst.ctrl.mpexec/CHANGES.rst"
+    directory = "doc/changes"
+    title_format = "Multi-Processing Executor {version} {project_date}"
+    issue_format = "`{issue} <https://jira.lsstcorp.org/browse/{issue}>`_"
+
+
+    [[tool.towncrier.type]]
+        directory = "feature"
+        name = "New Features"
+        showcontent = true
+
+    [[tool.towncrier.type]]
+        directory = "api"
+        name = "API Changes"
+        showcontent = true
+
+    [[tool.towncrier.type]]
+        directory = "bugfix"
+        name = "Bug Fixes"
+        showcontent = true
+
+    [[tool.towncrier.type]]
+        directory = "perf"
+        name = "Performance Enhancement"
+        showcontent = true
+
+    [[tool.towncrier.type]]
+        directory = "other"
+        name = "Other Changes and Additions"
+        showcontent = false
+
+    [[tool.towncrier.type]]
+        directory = "misc"
+        name = "Miscellaneous Changes of Minor Interest"
+        showcontent = false
+
+    [[tool.towncrier.type]]
+        directory = "removal"
+        name = "An API Removal or Deprecation"
+        showcontent = false