fix: swap event_timestamp with branch in add_turns

[jona62]

fix: swap event_timestamp with branch in add_turns

• Updated unit tests to reflect the proper logic

Ran the precommit hook locally.
The existing tests will fail because the behaviour has changed but thats the same tests I've updated

uv run pre-commit run --all-files
uv-lock..................................................................Passed
ruff (legacy alias)......................................................Passed
ruff format..............................................................Passed
trim trailing whitespace.................................................Passed
fix end of files.........................................................Passed
check toml...............................................................Passed
check json...........................................(no files to check)Skipped
check for merge conflicts................................................Passed
check for added large files..............................................Passed
debug statements (python)................................................Passed
bandit...................................................................Passed
pytest with coverage.....................................................Passed

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