Fix CKAN 2.10/2.11 compatibility for Activity model imports and database initialization

[Copilot]

CKAN 2.10+ tests were failing due to import errors and database initialization timing issues.

Changes

• Activity model import compatibility: Catch ModuleNotFoundError in addition to ImportError when attempting to import from ckan.model.activity. In CKAN 2.10+, the Activity class lives directly in ckan.model rather than a separate module.

  # CKAN 2.10+ Activity is in core_model, older versions in separate module
  try:
      from ckan.model.activity import Activity
  except (ImportError, ModuleNotFoundError):
      Activity = core_model.Activity

• Database initialization resilience: Broadened exception handling in tables_exist() to catch all exceptions during database checks. Prevents plugin initialization failures when CKAN core tables don't exist yet during ckan db init.

Applied to:

• ckanext/versions/logic/action.py
• ckanext/versions/logic/dataset_version_action.py
• ckanext/versions/model.py

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