expect's customMessage not working for all matchers

[lcrespilho]

Describe the bug
The customMessage parameter of expect module is not working for all matchers. For instance, it doesn't work for toBeGreaterThan matcher.

Steps to Reproduce

1. Create a file named demo_test.ts with these contents:

import { expect } from 'jsr:@std/expect'

Deno.test('mytest', () => {
  expect(1, 'My Custom Message').toBeGreaterThan(2)
})

2. Execute this command on the terminal to run the test:
   deno test

3. The output contains:

mytest => ./demo_test.ts:3:6
error: AssertionError: Expected 1 to be greater than 2
      throw new AssertionError(
            ^

Expected behavior

The output should include the customMessage parameter, like:

mytest => ./demo_test.ts:3:6
error: AssertionError: Expected 1 to be greater than 2: My Custom Message
      throw new AssertionError(
            ^

Environment

• OS: MacOS 15.1.1 Sequoia
• deno version: 2.1.1
• @std/assert version: 1.0.8