allow redefined aliases in with.

[xtcyclist]

What type of PR is this?

• bug
• feature
• enhancement

What problem(s) does this PR solve?

Issue(s) number:

Close https://github.com/vesoft-inc/nebula-ent/issues/1579

Description:

Redefined aliases shall be allowed in the with clause.

How do you solve it?

• Removed the guard on checking redefined aliases. Without the with clause, redefined aliases work fine, except that return * would report redudant errors.
• Remove redudant columns in the return clause. For example, the return as in match (v)-[e]-(v) where .... return * shall not contain two vs.

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

Checklist:

Tests:

• Unit test(positive and negative cases)
• Function test
• Performance test
• TCK

Affects:

• Documentation affected (Please add the label if documentation needs to be modified.)
• Incompatibility (If it breaks the compatibility, please describe it and add the label.）
• If it's needed to cherry-pick (If cherry-pick to some branches is required, please label the destination version(s).)
• Performance impacted: Consumes more CPU/Memory

Release notes:

Please confirm whether to be reflected in release notes and how to describe:

ex. Fixed the bug .....