revert: "perf: optimize request count for manifest and blob deletion"

[qweeah]

Reverts #1109

[shizhMSFT]

Reverting #1109 as the previous PR was merged in the wrong way.

[codecov-commenter]

Codecov Report

Merging #1115 (af0bed7) into main (6609ecb) will decrease coverage by 0.04%.
The diff coverage is 95.45%.

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@@            Coverage Diff             @@
##             main    #1115      +/-   ##
==========================================
- Coverage   80.40%   80.37%   -0.04%     
==========================================
  Files          57       57              
  Lines        2945     2940       -5     
==========================================
- Hits         2368     2363       -5     
  Misses        398      398              
  Partials      179      179              

Files Changed	Coverage Δ
cmd/oras/root/blob/delete.go	82.60% <ø> (-0.25%)	⬇️
cmd/oras/root/manifest/delete.go	82.19% <ø> (-1.36%)	⬇️
cmd/oras/internal/option/remote.go	78.36% <75.00%> (ø)
cmd/oras/internal/option/spec.go	92.59% <100.00%> (ø)
cmd/oras/root/attach.go	82.64% <100.00%> (+0.59%)	⬆️
cmd/oras/root/push.go	78.45% <100.00%> (+0.11%)	⬆️
internal/registryutil/auth.go	100.00% <100.00%> (ø)

[shizhMSFT]

#1109 will be re-created to optimize future git blame.

[shizhMSFT]

LGTM