fix!: `web.update` storage batch apply

[fmorency]

merk doesn't support applying b1 and b2 where

• b1 contains a Delete operation and
• b2 contains a Put operation over the same key.

E.g.

let b1 = vec![(b"key".to_vec(), Op::Delete)];
storage.apply(&b1)?;
let b2 = vec![(b"key".to_vec(), Op::Put(b"value".to_vec()))];
storage.apply(&b2)?;
storage.commit(&[])?;

The above doesn't work. The Put operation in b2 is ignored.

Relates https://github.com/liftedinit/ghostcloud/issues/40

[codecov[bot]]

Codecov Report

Merging #416 (c3b9ec7) into main (60eefa9) will decrease coverage by 0.03%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #416      +/-   ##
==========================================
- Coverage   81.83%   81.80%   -0.03%     
==========================================
  Files         149      149              
  Lines       16811    16785      -26     
==========================================
- Hits        13757    13731      -26     
  Misses       3054     3054              

Files	Coverage Δ
src/many-web/src/storage.rs	74.57% <100.00%> (-1.76%)	:arrow_down:

:mega: We’re building smart automated test selection to slash your CI/CD build times. Learn more