Reproduce recent changes for 0.5.1

[tsalo]

Closes none.

Changes proposed in this pull request

• Reproduce Split HCP tasks into task and run entities #952, Remove flake8-warnings from dependencies #947, Pin Nilearn version #955, Fix resting-state plots in executive summary #941, Concatenate across directions as well as runs #965, Don't interpolate volumes at beginning/end of run #950, Update the QC metrics #958 for 0.5.1 (paper) release.

[codecov]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Files	Coverage Δ
xcp_d/interfaces/plotting.py	87.86% <100.00%> (+0.10%)	⬆️
xcp_d/interfaces/report.py	96.66% <100.00%> (ø)
xcp_d/utils/bids.py	87.45% <100.00%> (+0.26%)	⬆️
xcp_d/utils/qcmetrics.py	88.52% <ø> (ø)
xcp_d/utils/utils.py	98.80% <100.00%> (+0.10%)	⬆️
xcp_d/workflows/base.py	97.12% <100.00%> (ø)
xcp_d/workflows/concatenation.py	87.23% <ø> (ø)
xcp_d/interfaces/execsummary.py	91.78% <93.54%> (-0.35%)	⬇️
xcp_d/utils/hcp2fmriprep.py	10.07% <16.66%> (+0.40%)	⬆️

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