tools: enforce function name matching in linter

Checklist

• make -j8 test (UNIX), or vcbuild test nosign (Windows) passes
• commit message follows commit guidelines

Affected core subsystem(s)

tools

Description of change

ESLint has a func-name-matching rule that requires that function names match the variable or property to which they are being assigned.

The code base currently has 100% compliance with this rule.

Enable the rule to keep it that way.