Set remove_date when creating plantings according to its life_cycle.

[horenso]

Summary

Set remove_date automatically according to the plants life cycle. The code is ok but it may be better to change the data type of life_cycles of plants in the db. Option<Vec<Option<LifeCycle>>> is such a ridiculous type, it should be Vec<LifeCycle> if LifeCycle is not enough, or if we prefer nullable (It's a different debate whether nullable strings and lists make sense ever) It can be Option<Vec<LifeCycle>>.

We may want to consider in the database:
ife_cycles life_cycle[] NOT NULL DEFAULT ARRAY[]::life_cycle[]
and
ALTER TABLE plants ADD CONSTRAINT no_null_life_cycles CHECK (NOT ARRAY[NULL] <@ life_cycles);

(If there is no logic reason it be very to create a migration that just the longest life_cycle per plant)

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