Proposed changes

This PR addresses issue #6674 by replacing explicit panics with returned errors in the template loader.

• Updated pkg/catalog/loader/loader.go to return a formatted error instead of crashing when dialers are nil.
• Refactored syncutil.New to safely propagate errors back to the caller.
• Ensured all dependent files like runner.go and nuclei_sdk.go handle these new error returns gracefully.

Proof

• Added a regression test TestLoadTemplates_NoDialers in pkg/catalog/loader/loader_test.go to verify the fix.
• This test confirms that the system returns an error instead of panicking when dialers are missing.
• Verified that all 120+ existing unit tests pass locally.

Checklist

• Pull request is created against the dev branch
• All checks passed with my changes
• I have added tests that prove my fix is effective
• I have added necessary documentation

/claim #6674

Summary by CodeRabbit

• Bug Fixes

  • Template loading failures now return clear errors and halt execution instead of being ignored.

• Refactor

  • Broadened error handling around template-loading and execution paths; several load-related panic/ignore paths converted to explicit errors.

• Tests

  • Added tests and updated benchmarks to assert and validate template-loading error behavior.