fix(eds/cache): Fix prealloc for proof nodes

[walldiss]

Previous prealloc calc was incorrect resulting in higher allocation than needed. This is chart of amount of allocation we should have done and actually done:

eds size; needed alloc; real alloc
2 3 4
4 7 24
8 15 112
16 31 480
32 63 1984
64 127 8064
128 255 32512
256 511 130560
512 1023 523264

Fixes #3858

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 44.94%. Comparing base (2469e7a) to head (c6a1685).
Report is 341 commits behind head on main.

Files with missing lines	Patch %	Lines
share/ipld/nmt_adder.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3860      +/-   ##
==========================================
+ Coverage   44.83%   44.94%   +0.10%     
==========================================
  Files         265      314      +49     
  Lines       14620    21789    +7169     
==========================================
+ Hits         6555     9793    +3238     
- Misses       7313    10969    +3656     
- Partials      752     1027     +275     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[Wondertan]

Good self catch

[renaynay]

Oh wow

[Wondertan]

Link #3858

[odeke-em]

Thank you for the fix @walldiss! I highly would encourage adding a test to lock this behavior as it is subtle and even if it changed from a revert (say if something unrelated broke) it would never be caught.