Consolidate C++ conda recipes and add libcugraph-tests package

[jjacobelli]

This PR includes the following changes:

• Adds a libcugraph-tests package to the libcugraph recipe
  • This is a prerequisite for removing "Project Flash" from our build/CI scripts
  • The libcugraph-tests package was added as an additional output to the existing libcugraph recipe (which was renamed to libcugraph-split)
• Consolidates remaining C++ recipes into libcugraph-split recipe
  • This gets rid of a lot of duplicate code between the recipes and reduces the number of times we have to call conda build in our CI scripts

[rlratzel]

It looks like this PR has the same changes as #2094 . Can we close #2094?

[jjacobelli]

It looks like this PR has the same changes as #2094 . Can we close #2094?

Yes, done

[ajschmidt8]

rerun tests

[jjacobelli]

rerun tests

[codecov-commenter]

Codecov Report

Merging #2124 (2dda127) into branch-22.06 (9956084) will increase coverage by 0.04%.
The diff coverage is n/a.

❗ Current head 2dda127 differs from pull request most recent head a83908d. Consider uploading reports for the commit a83908d to get more accurate results

@@               Coverage Diff                @@
##           branch-22.06    #2124      +/-   ##
================================================
+ Coverage         70.82%   70.86%   +0.04%     
================================================
  Files               170      170              
  Lines             11036    11036              
================================================
+ Hits               7816     7821       +5     
+ Misses             3220     3215       -5     

Impacted Files	Coverage Δ
.../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_graph_store.py	100.00% <0.00%> (+1.56%)	⬆️
python/cugraph/cugraph/tests/test_utils.py	75.55% <0.00%> (+4.44%)	⬆️

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[ajschmidt8]

@gpucibot merge