Enable MG support for small datasets

[jnke2016]

This PR enables MG support for very small datasets where the number of partitions is smaller than the number of workers

Dependent on issue #2217 to be resolved before merging
closes #2196

[codecov-commenter]

Codecov Report

Merging #2216 (3674b7d) into branch-22.06 (38be932) will increase coverage by 0.19%.
The diff coverage is n/a.

@@               Coverage Diff                @@
##           branch-22.06    #2216      +/-   ##
================================================
+ Coverage         70.82%   71.01%   +0.19%     
================================================
  Files               170      170              
  Lines             11036    11105      +69     
================================================
+ Hits               7816     7886      +70     
+ Misses             3220     3219       -1     

Impacted Files	Coverage Δ
python/cugraph/cugraph/dask/common/part_utils.py	19.23% <ø> (-0.94%)	⬇️
python/cugraph/cugraph/gnn/graph_store.py	82.60% <ø> (+11.77%)	⬆️
python/cugraph/cugraph/structure/hypergraph.py	90.00% <ø> (ø)
python/cugraph/cugraph/tests/test_graph_store.py	100.00% <ø> (+1.56%)	⬆️
.../cugraph/tests/test_edge_betweenness_centrality.py	84.93% <0.00%> (+0.60%)	⬆️
...graph/cugraph/tests/test_betweenness_centrality.py	83.01% <0.00%> (+0.62%)	⬆️
python/cugraph/cugraph/tests/test_utils.py	75.55% <0.00%> (+4.44%)	⬆️

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[BradReesWork]

@gpucibot merge