Fix/inner variable race condition

[Shylock-Hg]

What type of PR is this?

• bug
• feature
• enhancement

What problem(s) does this PR solve?

Issue(s) number:

Close #4845
Close https://github.com/vesoft-inc/nebula-ent/issues/1576
Close #4843

Description:

In previous, try to force user create list comprehension/reduce/predication expression with unique variable name, but this change lead to too much wired object dependencies, so this PR just fix two mistake generation of inner variable.
In the future, plan to refactor inner variable by remove it from the global variable map to Expression Eval Context. This will resolve these problems completely and could fix the related #4844 .

How do you solve it?

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
• N/A

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 .....

[codecov-commenter]

Codecov Report

Base: 84.56% // Head: 84.62% // Increases project coverage by +0.06% 🎉

Coverage data is based on head (142a4aa) compared to base (63a63ac).
Patch coverage: 93.84% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4850      +/-   ##
==========================================
+ Coverage   84.56%   84.62%   +0.06%     
==========================================
  Files        1358     1358              
  Lines      136387   136396       +9     
==========================================
+ Hits       115331   115425      +94     
+ Misses      21056    20971      -85     

Impacted Files	Coverage Δ
src/graph/visitor/VidExtractVisitor.cpp	48.83% <50.00%> (-0.15%)	⬇️
src/storage/test/GetPropTest.cpp	94.80% <88.46%> (-0.54%)	⬇️
src/graph/util/ExpressionUtils.cpp	94.76% <93.75%> (-0.11%)	⬇️
src/graph/util/ParserUtil.cpp	94.01% <93.75%> (-0.16%)	⬇️
src/common/plugin/fulltext/FTUtils.h	72.34% <100.00%> (+6.30%)	⬆️
src/graph/context/ExecutionContext.cpp	92.98% <100.00%> (+0.12%)	⬆️
src/graph/context/QueryContext.cpp	100.00% <100.00%> (ø)
src/graph/context/QueryContext.h	91.66% <100.00%> (ø)
src/graph/context/Symbols.cpp	91.78% <100.00%> (-0.33%)	⬇️
src/graph/context/Symbols.h	100.00% <100.00%> (ø)
... and 45 more

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