A0-3143: Major sync test does not use pre-baked workdir.

[Marcin-Radecki]

Description

This PR removes pre-baked workdir file used in major sync test. Motivations are:

• that workdir was generated on 11.X version. It has happened on the main branch in which there was a change that changed database schema in a way that finalization does not work. This test is supposed to validate whether node is able to sync in major sync mode, ie when gap is greater then 2 sessions, and not major update scenario which it does now
• workdir contributes to 20% of whole aleph-node size and it bloats git history
• as it is now, we need to regenerate workdir every time such breaking change occurrs, after this PR is merge we won't have to do it

Also, this PR removes some tech debt which is:

• removed not used code for python tests, which functionality is covererd by major sync and force reorgs tests
• added common bash script for running python tests

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Testing

• normal session nightly pipeline pass https://github.com/Cardinal-Cryptography/aleph-node/actions/runs/6798163085/job/18482394829

[kostekIV]

<3

[woocash2]

Not having the greatest feeling about test_catch_up and test_multiple_restarts, although test_major_sync is more massive and expects the same result (some node catching up to other nodes) as the removed tests, the removed tests checked slightly different scenarios (for example in test_multiple_restarts the node is restarted many times and expected to catch up each time). While agreeing the value of these tests is low in presence of the major sync test, I still think it is non-zero 😃. Anyways, remove them if you're convinced that it's fine.