refactor cache cleanup logic in UpdateContextForReplacedHeader

[AdoAdoAdo]

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?

[Copilot]

Pull request overview

This PR refactors UpdateContextForReplacedHeader to avoid unnecessary (and potentially harmful) cache cleanup when the current execution result matches the execution result that will be set, and updates unit tests accordingly.

Changes:

• Make cache cleanup conditional on the current execution result being non-nil and having a different header hash than the target execution result.
• Adjust an existing test to ensure cache cleanup is exercised by using a different current execution result hash.
• Add a new test verifying cache cleanup is skipped when current and target execution results share the same header hash.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
process/common.go	Adds a guard to only clean caches when replacing with a different execution result (by header hash).
process/common_test.go	Updates/extends tests to cover both “cleanup called” and “cleanup skipped” scenarios.

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[Copilot]

Import grouping: github.com/multiversx/mx-chain-go/storage is split into its own import block, while other files keep all mx-chain-go/... imports together (e.g. process/interface.go). Consider grouping storage with the other mx-chain-go imports to match the repository convention and avoid goimports/gofmt churn.

Suggested change

	"github.com/multiversx/mx-chain-go/storage"
	"github.com/multiversx/mx-chain-go/common"
	"github.com/multiversx/mx-chain-go/dataRetriever"
	"github.com/multiversx/mx-chain-go/state"
	"github.com/multiversx/mx-chain-go/common"
	"github.com/multiversx/mx-chain-go/dataRetriever"
	"github.com/multiversx/mx-chain-go/state"
	"github.com/multiversx/mx-chain-go/storage"