[doc] More release note about session data handling mentionning deprecation of _cw.data and removal of get/set_shared_data.

[session] Drop long deprecated [get/set]_shared_data methods they are deprecated since 3.19 and access to the .data attribute itself deprecated in 3.25, so it's time to drop them.

[session] Drop the user session synchronization machinery which should not be necessary anymore since groups and properties are fetched for each request (cache lives in transaction_data).

[session] Avoid deprecation warning on access to Connection.data this attribute has been deprecated during the session related rework, remove warning by explicitly storing data in .transaction_data since session data is not anymore reachable through Connection object. This will allows simplification of session synchronization hooks in a later cset. Also since we do not rely anymore on session data here, we may at some point rewrite those properties to rely on the ORM instead of such custom caching.

[doc] Add release note about change in uicfg

merge 3.25 heads

[hg] Add generated slapd.conf to hgignore

Fix flake8 errors in unittest_cwctl

[cwctl] Drop 'cubicweb_' prefix when displaying cubes with 'cubicweb-ctl list' consistently with newcube / create commands. This is an alternate implementation to backed out changeset fe995d56c949. Closes #17054738

Fix flake8 errors in unittest_cwconfig

[config] Test loading of ccplugin modules to ensure ccplugin modules of cube as package aren't loaded twice, once as `cubicweb_<cube>.ccplugin`, once as `cubes.<cube>.ccplugin`. This test used to fail until fe995d56c949 has been backout. It requires calling `cleanup_sys_module` in `CubicWebConfigurationTC.tearDown` to remove any cube's submodule loaded during tests, so content of `sys.modules` may be tested.

[test] Extract out method-which-is-not-a-method mocking iter_entry_points to ease reuse and improve readability.