Duplicate $alert Sass variables

[endcoreAK]

Prerequisites

• I have searched for duplicate or closed issues
• I have validated any HTML to avoid common problems
• I have read the contributing guidelines

Describe the issue

Even if the color scale will be removed with v6 these variables are currently duplicated into variables.scss. Was this forgotten, or is there a reason regarding the documentation?

$alert-bg-scale:                -80% !default;
$alert-border-scale:            -70% !default;
$alert-color-scale:             40% !default;

$alert-bg-scale:                -80% !default; // Deprecated in v5.2.0, to be removed in v6
$alert-border-scale:            -70% !default; // Deprecated in v5.2.0, to be removed in v6
$alert-color-scale:             40% !default; // Deprecated in v5.2.0, to be removed in v6

Reduced test cases

https://github.com/twbs/bootstrap/blob/main/scss/_variables.scss#L1546-L1555

What operating system(s) are you seeing the problem on?

macOS

What browser(s) are you seeing the problem on?

No response

What version of Bootstrap are you using?

5.3.0-alpha3

[julien-deramond]

Good catch @endcoreAK! It's handled in #38674.