fix: 静的な式がラベル付きの式を許容する問題を修正

[takejohn]

What

静的な式においてラベル付きの式を記述するとエラーが発生するようにします。
メタデータ構文や属性、AiSONに影響があります。

Why

Fixes #993

Additional info (optional)

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Files with missing lines	Coverage Δ
src/parser/syntaxes/expressions.ts	95.46% <100.00%> (ø)

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