refactor: vacuum temporary files also cleans inactive temp table data

[dantengsky]

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Summary

Currently, VACUUM TEMPORARY FILES only cleans temporary data generated by spilling, in this PR, it cleans inactive temp table data as well.

Previously, the schema returned by VACUUM TEMPORARY FILES is :

Files: uint64

where the Files column shows the number spill files cleaned.

In this PR, the schema changed to:

spill_files           :   uint64,
temp_table_sessions   :   uint64,

where

• the spill_files column represents the count of spill files cleaned.
• the temp_table_sessions column represents the count of inactive sessions for which temporary tables were cleaned.

During execution, the limit specified by the LIMIT <limit> clause is applied sequentially: first to spill files, then to inactive sessions.

Tests

• Unit Test
• Logic Test
• Benchmark Test
• No Test - Explain why

Type of change

• Bug Fix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)
• Breaking Change (fix or feature that could cause existing functionality not to work as expected)
• Documentation Update
• Refactoring
• Performance Improvement
• Other (please describe):

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This change is 

[dantengsky]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Bravo.

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