refactor: bump go header and complete rollback command

[julienrbrt]

We need to bump the go-header (https://github.com/celestiaorg/go-header/releases/tag/v0.7.0) to access the DeleteTo method, which is required when we want to rollback a chain.
The header and data sync goheader stores should be rolled back as well.

ref: evstack/ev-abci#236, https://github.com/ignite/apps/pull/223/files

[github-actions]

The latest Buf updates on your PR. Results from workflow CI and Release / buf-check (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	⏩ skipped	✅ passed	✅ passed	Sep 4, 2025, 8:41 PM

[codecov]

Codecov Report

❌ Patch coverage is 27.69231% with 47 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.06%. Comparing base (6d93f12) to head (a551ba5).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/sync/sync_service.go	27.69%	39 Missing and 8 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2618      +/-   ##
==========================================
- Coverage   71.07%   71.06%   -0.01%     
==========================================
  Files          73       73              
  Lines        7644     7638       -6     
==========================================
- Hits         5433     5428       -5     
  Misses       1756     1756              
+ Partials      455      454       -1     

Flag	Coverage Δ
combined	71.06% <27.69%> (-0.01%)	⬇️

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