refactor: minor refactor on fragment graph building #14560

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8 tasks still to be completed

Task	Status
remove the unused field `upstream_column_ids` for `CdcFilterNode`. Because CDC source's schema is fixed.	Incomplete
Summarize your change (mandatory)	Incomplete
How does this PR work? Need a brief introduction for the changed logic (optional)	Incomplete
Describe clearly one logical change and avoid lazy messages (optional)	Incomplete
Describe any limitations of the current code (optional)	Incomplete
Refer to a related PR or issue link (optional)	Incomplete
I have written necessary rustdoc comments	Incomplete
I have added necessary unit tests and integration tests	Incomplete
I have added test labels as necessary. See details.	Incomplete
I have added fuzzing tests or opened an issue to track them. (Optional, recommended for new SQL features #7934).	Incomplete
My PR contains breaking changes. (If it deprecates some features, please create a tracking issue to remove them in the future).	Incomplete
All checks passed in `./risedev check` (or alias, `./risedev c`)	Incomplete
My PR contains critical fixes that are necessary to be merged into the latest release. (Please check out the details)	Incomplete
My PR needs documentation updates. (Please use the Release note section below to summarize the impact on users)	Incomplete
PR #14465	Incomplete
PR #14171	Incomplete