fix: cap max duration of triffid pollen, string-ify time amounts for venom effects

[chaosvolt]

Checklist

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• I wrote the PR title in conventional commit format.
• I ran the code formatter.
• I linked any relevant issues using github keyword syntax so it can be closed automatically.
• I have committed my changes to new branch that isn't main so it won't cause conflict when updating main branch later.

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Purpose of change

Discussion in the BN server led me to notice that the triffid pollen effect introduced in #4154 has no max duration, which is generally something we prefer not to pair with an effect being able to inflict damage over time on the player.

Along the way I spotted a few other oddities.

Describe the solution

1. Assigned a max duration of 1 hour to triffid pollen.
2. Converted the two venom effects from integer durations to strings.

Describe alternatives you've considered

Screaming.

Testing

1. Checked affected file for syntax and lint errors.
2. Load-tested in compiled test build.
3. Hotboxed myself in a cloud of alien plant jizz and confirmed the debug menu showed the duration wasn't exceeding the expected amount.

Additional context