Remove old trigger vars in 3xx (SYN-7750)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.21%. Comparing base (101a9fc) to head (1198ed4). Report is 16 commits behind head on synapse-3xx.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## synapse-3xx #3855 +/- ## =============================================== - Coverage 96.22% 96.21% -0.02% =============================================== Files 232 232 Lines 51829 51829 =============================================== - Hits 49874 49865 -9 - Misses 1955 1964 +9 ``` | [Flag](https://app.codecov.io/gh/vertexproject/synapse/pull/3855/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=vertexproject) | Coverage Δ | | |---|---|---| | [linux](https://app.codecov.io/gh/vertexproject/synapse/pull/3855/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=vertexproject) | `96.21% <100.00%> (-0.02%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=vertexproject#carryforward-flags-in-the-pull-request-comment) to find out more.

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