chore: apply go fix improvements

[echarrod]

Apply go fix to modernize the codebase:

• Add missing imports
• Optimize string concatenation using strings.Builder (performance improvement over concatenation loops)
• Use Go 1.22 range-over-int syntax (for i := range N instead of for i := 0; i < N; i++)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 7b9ab330-78c6-4705-b488-6f9416234a25

📥 Commits

Reviewing files that changed from the base of the PR and between a6b358a and f9ea1dc.

📒 Files selected for processing (8)

• eventfilter_test.go
• filter.go
• internal/cron/cron.go
• internal/stack/stack.go
• run.go
• state.go
• update.go
• workflow_internal_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch echarrod/go-fix-improvements

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud