refactor(query): reduce string allocations in hot paths

[sundy-li]

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Summary

Reduce unnecessary string allocations in frequently-executed code paths by replacing inefficient string concatenation patterns with direct write!() calls.

Changes

• Query result formatting (physical_plans/format/common.rs): Replace += &format!() with write!() to avoid intermediate String allocations in pruning statistics generation

• Parser errors (parser/error.rs): Use write!() instead of += &format!() pattern

• Optimizer trace (optimizer/pipeline/trace/trace.rs): Replace push_str(&format!()) with write!()/writeln!() throughout the trace report generation

Before:

blocks_pruning_description += &format!("range pruning: {} to {}", before, after);
summary.push_str(&format!("[{}] {}: {}\n", status, index, name));

After:

write!(blocks_pruning_description, "range pruning: {} to {}", before, after).unwrap();
writeln!(summary, "[{}] {}: {}", status, index, name).unwrap();

These paths are executed per-query, making allocation reduction meaningful at scale.

Continues the work from #19163.

Tests

• No Test - Build and clippy verified locally

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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