Add function to create WAL files

[lucasrod16]

Relates to #18574 (comment)

This PR adds a new function to consolidate WAL file creation into a single function to help reduce errors and make the process more consistent.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: lucasrod16
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[k8s-ci-robot]

Hi @lucasrod16. Thanks for your PR.

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[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

Attention: Patch coverage is 68.75000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 68.84%. Comparing base (9fc3b2a) to head (081c94f).

❗ Current head 081c94f differs from pull request most recent head d0cd63a

Please upload reports for the commit d0cd63a to get more accurate results.

Files with missing lines	Patch %	Lines
server/storage/wal/wal.go	71.42%	2 Missing and 2 partials ⚠️
server/storage/wal/file_pipeline.go	0.00%	0 Missing and 1 partial ⚠️

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Additional details and impacted files

Files with missing lines	Coverage Δ
server/storage/wal/repair.go	56.14% <100.00%> (ø)
server/storage/wal/file_pipeline.go	90.69% <0.00%> (ø)
server/storage/wal/wal.go	57.73% <71.42%> (+0.27%)	⬆️

... and 18 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #18605      +/-   ##
==========================================
+ Coverage   68.79%   68.84%   +0.04%     
==========================================
  Files         420      420              
  Lines       35519    35532      +13     
==========================================
+ Hits        24437    24461      +24     
+ Misses       9655     9644      -11     
  Partials     1427     1427              

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