fix(inspect): allow single-line format when breakLength is Infinity

[hamidrezaghavami]

Description

When calling util.inspect() with a breakLength configuration explicitly set to Infinity, the internal layout formatting logic should bypass multi-line chunking and formatting constraints entirely, allowing the contents to naturally evaluate on a single line.

Currently, isBelowBreakLength goes through a character length loop calculation even when length checks are logically unnecessary due to the infinite upper bound. This change introduces an explicit early return branch within isBelowBreakLength when ctx.breakLength === Infinity, properly enabling a clean, un-wrapped single-line string formatting mode.

Checklist

• Core internal utility verification

[ljharb]

this definitely needs tests to cover the changed behavior. ideally, you'd also provide the tests' output absent this change.