Simplify action_tasks

[ianmkenney]

action_tasks previously issued queries for each task to be actioned. This PR reduces this to a single query using the UNWIND clause, while accounting for the potential order loss from the UNWIND. Local tests show equal to improved performance depending on the number of tasks actioned. For $n=1$ tasks, the performance remains unchanged (~0.3 s). For $n=10, 100, 1000$, however, the runtime is reduced by (very) roughly $50\%$, $80\%$, and $90\%$, respectively. More concretely this comes out to around:

• $n=10$; $0.7$ s to $0.4$ s
• $n=100$; $3$ s to $0.6$ s
• $n=1000$; $24$ s to $1.6$ s

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.86%. Comparing base (36731f4) to head (6f8f84a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #249      +/-   ##
==========================================
- Coverage   82.30%   81.86%   -0.44%     
==========================================
  Files          26       26              
  Lines        3068     3066       -2     
==========================================
- Hits         2525     2510      -15     
- Misses        543      556      +13     

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[dotsdl]

Awesome work @ianmkenney! Is this ready for review?

[ianmkenney]

@dotsdl Will request review after merging #244 and resolving the ensuing conflicts

[ianmkenney]

@dotsdl should be good for review

[dotsdl]

Looks excellent @ianmkenney! Merge when satisfied!