fix: fix gs.clear_cache(). clear symbol pos set

[He1pa]

1. Does this PR affect any open issues?(Y/N) and add issue references (e.g. "fix #123", "re #123".):

• N
• Y fix [Bug] Unexpected completion items for schema list #1452 [Bug] Wrong completion items for the attribute operator for the assign stmt #1447

2. What is the scope of this PR (e.g. component or file name):

kclvm/sema/src/core/symbol.rs

3. Provide a description of the PR(e.g. more details, effects, motivations or doc link):

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Other

4. Are there any breaking changes?(Y/N) and describe the breaking changes(e.g. more details, motivations or doc link):

• N
• Y

5. Are there test cases for these changes?(Y/N) select and add more details, references or doc links:

• Unit test
• Integration test
• Benchmark (add benchmark stats below)
• Manual test (add detailed scripts or steps below)
• Other

[coveralls]

Pull Request Test Coverage Report for Build 9773245730

Details

• 5 of 5 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.006%) to 71.44%

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Totals
Change from base Build 9772846459:	0.006%
Covered Lines:	56206
Relevant Lines:	78676

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💛 - Coveralls

[Peefy]

LGTM