Move Bleve and Elastic code indexers to use a common cat-file --batch

[zeripath]

Both bleve and elastic code indexers will call cat-file blob blobsha repeatedly for each file indexed. By using a single cat-file --batch we can reduce these multiple calls to a single common cat-file batch.

Signed-off-by: Andrew Thornton art27@cantab.net

[codecov-io]

Codecov Report

Merging #14781 (b10ab24) into master (487f2ee) will decrease coverage by 0.01%.
The diff coverage is 38.15%.

@@            Coverage Diff             @@
##           master   #14781      +/-   ##
==========================================
- Coverage   42.21%   42.20%   -0.02%     
==========================================
  Files         767      771       +4     
  Lines       81624    82093     +469     
==========================================
+ Hits        34458    34646     +188     
- Misses      41531    41800     +269     
- Partials     5635     5647      +12     

Impacted Files	Coverage Δ
models/action.go	48.52% <0.00%> (-2.42%)	⬇️
models/migrations/migrations.go	2.59% <ø> (ø)
models/migrations/v166.go	0.00% <0.00%> (ø)
models/migrations/v172.go	0.00% <0.00%> (ø)
models/migrations/v173.go	0.00% <0.00%> (ø)
models/oauth2.go	29.16% <0.00%> (-2.66%)	⬇️
models/session.go	0.00% <0.00%> (ø)
models/user.go	53.05% <ø> (+0.38%)	⬆️
modules/context/context.go	65.22% <0.00%> (+6.72%)	⬆️
modules/git/pipeline/lfs_nogogit.go	0.00% <0.00%> (ø)
... and 64 more

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[techknowlogick]

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