refactor: clean code

[rtritto]

Description

Clean code

Checklist

• I have signed the Contributor License Agreement (https://www.mongodb.com/legal/contributor-agreement)
• New tests and/or benchmarks are included
• Documentation is changed or added

[Copilot]

Pull request overview

Refactors small pieces of the AST execution/safety-check logic in shell-bson-parser and makes minor cleanup tweaks in BSON-to-JS stringification in query-parser.

Changes:

• Flattened nested if checks in executeAST / checkTree into a single compound condition.
• Simplified checkSafeCall control flow by combining allowMethods + callee-type checks.
• Minor cleanup in stringification: optional catch binding and using new RegExp(...) for validation.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
packages/shell-bson-parser/src/eval.ts	Refactors executeAST condition structure.
packages/shell-bson-parser/src/check.ts	Refactors checkSafeCall and checkTree condition structure.
packages/query-parser/src/stringify.ts	Minor cleanup in date/regExp stringification error handling/validation.

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