ISSUE-11389 - Add retrieve_full_tracker to FailSafeTrackerStore

[fliak]

Proposed changes:

• Add method retrieve_full_tracker to avoid hiding ability of fetching full message history

Status (please check what you already did):

• [ ] added some tests for the functionality
• [ ] updated the documentation
• [ ] updated the changelog (please check changelog for instructions)
• [ ] reformat files using black (please check Readme for instructions)

[CLAassistant]

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[sanchariGr]

Hi @fliak, thanks for your contribution if you'd still like to merge this PR could you please sign the CLA agreement? Also in order to merge this PR we need to fix the Code Quality fail which is currently complaining about rasa/core/tracker_store.py:1277:68: F821 undefined name 'sender_id', could you also please fix the issue?

[ancalita]

@fliak The retrieve_full_tracker method was added to FailSafeTrackerStore as of version 3.5.2, you can see the code on main branch as well: https://github.com/RasaHQ/rasa/blob/main/rasa/core/tracker_store.py#L1462 Closing this PR.