[CVAT][Exchange Oracle] Fix migrations

[Bobronium]

Description

Previously merged #2094 and #2554 caused conflict since both PRs contained migration having the same down_revision.

Summary of changes

• Fixed file name format for revision from [CVAT-M2] Oracles M2 API #2094
• Change down_revision for revision from [CVAT][Exchange Oracle] Add EscrowValidation and optimise state trackers #2554 to point to revision from [CVAT-M2] Oracles M2 API #2094

How test the changes

~/hmt/human-protocol/packages/examples/cvat/exchange-oracle ba/exchange-oracle/fix-migrations*
(exchange-oracle-py3.10) $ alembic upgrade head 
INFO  [alembic.runtime.migration] Context impl PostgresqlImpl.
INFO  [alembic.runtime.migration] Will assume transactional DDL.
INFO  [alembic.runtime.migration] Running upgrade 0f3fb7bfcbcf -> 2cbc85686054, Add assignment updated_at
INFO  [alembic.runtime.migration] Running upgrade 2cbc85686054 -> fde2b09b6b39, Add escrow_validations
                                                                                                                                                                             
~/hmt/human-protocol/packages/examples/cvat/exchange-oracle ba/exchange-oracle/fix-migrations*
(exchange-oracle-py3.10) $ alembic downgrade -2 
INFO  [alembic.runtime.migration] Context impl PostgresqlImpl.
INFO  [alembic.runtime.migration] Will assume transactional DDL.
INFO  [alembic.runtime.migration] Running downgrade fde2b09b6b39 -> 2cbc85686054, Add escrow_validations
INFO  [alembic.runtime.migration] Running downgrade 2cbc85686054 -> 0f3fb7bfcbcf, Add assignment updated_at

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