1987: LB: Rename LB Spec to LB Config

[JacobDomagala]

Fixes #1987

[github-actions]

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[codecov]

Codecov Report

Merging #1989 (887a729) into develop (bd9a23f) will decrease coverage by 0.01%.
The diff coverage is 86.77%.

❗ Current head 887a729 differs from pull request most recent head 6a0515d. Consider uploading reports for the commit 6a0515d to get more accurate results

@@             Coverage Diff             @@
##           develop    #1989      +/-   ##
===========================================
- Coverage    84.38%   84.36%   -0.02%     
===========================================
  Files          730      730              
  Lines        25644    25569      -75     
===========================================
- Hits         21640    21572      -68     
+ Misses        4004     3997       -7     

Impacted Files	Coverage Δ
src/vt/configs/arguments/app_config.h	100.00% <ø> (ø)
src/vt/runtime/runtime_banner.cc	65.50% <0.00%> (ø)
src/vt/vrt/collection/balance/baselb/baselb.h	100.00% <ø> (ø)
src/vt/vrt/collection/balance/greedylb/greedylb.h	100.00% <ø> (ø)
.../vt/vrt/collection/balance/hierarchicallb/hierlb.h	100.00% <ø> (ø)
.../vt/vrt/collection/balance/lb_invoke/lb_manager.cc	79.61% <0.00%> (ø)
...rc/vt/vrt/collection/balance/offlinelb/offlinelb.h	0.00% <0.00%> (ø)
src/vt/vrt/collection/balance/randomlb/randomlb.h	100.00% <ø> (ø)
src/vt/vrt/collection/balance/rotatelb/rotatelb.h	100.00% <ø> (ø)
.../vt/vrt/collection/balance/temperedlb/temperedlb.h	100.00% <ø> (ø)
... and 34 more

[cz4rs]

Looks good to me.

[nlslatt]

Looks good