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.

[hamidrezaghavami]

Hello, @ljharb The single-line formatting behaviour when breakLength is set to Infinity is covered in a test case that I have provided.
Behaviour of output for context:
Without this modification, if it causes internal length constraint checks, the output is automatically converted to a multi-line format that spans many lines.
With this modification, multi-line chunking is completely avoided by the internal layout logic, which evaluates the contents into a single line format precisely as anticipated:
"a: 1, b: 2, c: 3, d: 4 }"