Remove unused code (gunrock HITS)

[seunghwak]

Delete no-longer-used code

[codecov-commenter]

Codecov Report

Merging #2152 (6fdfb99) into branch-22.06 (017baab) will decrease coverage by 3.00%.
The diff coverage is 61.25%.

❗ Current head 6fdfb99 differs from pull request most recent head e710794. Consider uploading reports for the commit e710794 to get more accurate results

@@               Coverage Diff                @@
##           branch-22.06    #2152      +/-   ##
================================================
- Coverage         72.41%   69.40%   -3.01%     
================================================
  Files               157      170      +13     
  Lines             10496    11036     +540     
================================================
+ Hits               7601     7660      +59     
- Misses             2895     3376     +481     

Impacted Files	Coverage Δ
...aph/cugraph/dask/sampling/neighborhood_sampling.py	0.00% <0.00%> (ø)
.../cugraph/cugraph/experimental/compat/nx/DiGraph.py	0.00% <0.00%> (ø)
...on/cugraph/cugraph/experimental/compat/nx/Graph.py	0.00% <0.00%> (ø)
...thon/cugraph/cugraph/experimental/dask/__init__.py	0.00% <0.00%> (ø)
python/cugraph/cugraph/tests/dask/test_mg_hits.py	0.00% <0.00%> (ø)
...ugraph/tests/dask/test_mg_neighborhood_sampling.py	0.00% <0.00%> (ø)
.../cugraph/cugraph/tests/dask/test_mg_replication.py	0.00% <0.00%> (-33.34%)	⬇️
python/cugraph/cugraph/dask/link_analysis/hits.py	18.36% <18.36%> (ø)
...h/pylibcugraph/tests/test_neighborhood_sampling.py	20.83% <20.83%> (ø)
python/cugraph/cugraph/sampling/node2vec.py	81.81% <69.23%> (-9.30%)	⬇️
... and 28 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 017baab...e710794. Read the comment docs.

[ChuckHastings]

rerun tests

[BradReesWork]

rerun tests

[BradReesWork]

rerun tests

[ChuckHastings]

@gpucibot merge