Fix removing headers at bootstrap

[ssd04]

Reasoning behind the pull request

Proposed changes

Testing procedure

Pre-requisites

Based on the Contributing Guidelines the PR author and the reviewers must check the following requirements are met:

• was the PR targeted to the correct branch?
• if this is a larger feature that probably needs more than one PR, is there a feat branch created?
• if this is a feat branch merging, do all satellite projects have a proper tag inside go.mod?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.53%. Comparing base (8eab550) to head (9b5233c).

Additional details and impacted files

@@                      Coverage Diff                      @@
##           feat/supernova-async-exec    #7798      +/-   ##
=============================================================
- Coverage                      77.54%   77.53%   -0.01%     
=============================================================
  Files                            882      882              
  Lines                         123683   123690       +7     
=============================================================
+ Hits                           95908    95909       +1     
- Misses                         21429    21436       +7     
+ Partials                        6346     6345       -1     

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[Copilot]

Pull request overview

This PR addresses storage bootstrap behavior by cleaning up header-related storage entries for rounds above the configured BootstrapRoundIndex, preventing stale data from persisting across restarts.

Changes:

• Update loadBlocks() to immediately remove storage + notarized storage for bootstrap rounds above BootstrapRoundIndex.
• Add shard bootstrap tests validating cleanup behavior for BootstrapRoundIndex > 0 and BootstrapRoundIndex == 0.
• Add equivalent metachain bootstrap tests validating the same cleanup behavior.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 6 comments.

File	Description
process/sync/storageBootstrap/baseStorageBootstrapper.go	Cleans up storage entries for rounds above BootstrapRoundIndex during bootstrap iteration (not only after successful bootstrap).
process/sync/storageBootstrap/shardStorageBootstrapper_test.go	Adds tests asserting round cleanup behavior during shard storage bootstrap.
process/sync/storageBootstrap/metaStorageBootstrapper_test.go	Adds tests asserting round cleanup behavior during metachain storage bootstrap.

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[Copilot]

This subtest title has a grammatical error: "should cleaned all" -> "should clean all" (or similar).

Suggested change

	t.Run("bootstrapRoundIndex zero should cleaned all", func(t *testing.T) {
	t.Run("bootstrapRoundIndex zero should clean all", func(t *testing.T) {