Fix resting-state plots in executive summary

[tsalo]

Closes #938 and closes #940.

Changes proposed in this pull request

• Fix the description entity in the postprocessing carpet plot's query in the executive summary.
• Sort task file entities for the executive summary.
  • Previously, only the task name and run number were used to sort the task section.
• Build the task section names from task and run entities, along with any entities that are not constant across all of the subject's BOLD runs. This should help with datasets like the mobile-phenomics pilot, where single-echo and multi-echo runs are dissociated with the acq entity.
• Skip the final task section (carpets + mean BOLD + boldref + registration plots) for concatenated resting-state data, since (1) there's a section higher up for the concatenated resting-state carpets and (2) there are no mean BOLD, bolref, or registration plots for "runs" generated by the concatenation workflow.
• Move the "concatenated resting-state" carpet plot subsection from the "Anatomical Data" section to the "Functional Data" section.

[codecov]

Codecov Report

Patch coverage is 93.54% of modified lines.

Files Changed	Coverage
xcp_d/interfaces/execsummary.py	93.54%

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[tsalo]

Need to convert run numbers from floats to ints in the subsection names.

EDIT: done
EDIT 2: nvm. not done
EDIT 3: okay actually done