remove some useless code

[darionyaphet]

What type of PR is this?

• bug
• feature
• enhancement

What does this PR do?

Which issue(s)/PR(s) this PR relates to?

Special notes for your reviewer, ex. impact of this fix, etc:

Additional context:

Checklist：

• Documentation affected （Please add the label if documentation needs to be modified.)
• Incompatible （If it is incompatible, please describe it and add corresponding label.）
• Need to cherry-pick （If need to cherry-pick to some branches, please label the destination version(s).)
• Performance impacted: Consumes more CPU/Memory

Release notes：

Please confirm whether to reflect in release notes and how to describe:

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[czpmango]

collectZoneParts exists in this pr #3254.
If you delete it, please give some descriptions to explain why to delete it.
All review intentions should be recorded.

[darionyaphet]

collectZoneParts exists in this pr #3254. If you delete it, please give some descriptions to explain why to delete it. All review intentions should be recorded.

collectZoneParts not used and have replaced by assembleZoneParts