DPL Analysis: Use dangling edges context in more places

[aalkin]

• Use DEC in more places, moving some logic to init part of internal task callbacks
• minor cleanups

[github-actions]

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[ktf]

I see a slight increase in memory and reduction in performance for both histogramming tests I ran. Since a more complex analysis did not seem to be affected (on the contrary) I will blame the fact that running tests has a slight memory penalty due to the fact there is less processes using the same libraries. Please keep an eye on it tomorrow, though.