`.text-bg-*` helpers now use theme CSS variables (#38772)

* #38769 text-bg-primary now respects --bs-primary color

* Revert "#38769 text-bg-primary now respects --bs-primary color"

This reverts commit a4db90ff70.

* #38769 updated scss file to respect --bs-primary color with text-bg-primary class

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Co-authored-by: Cameron Hollis <cameronjhollis@gmail.com>

scss/helpers/_color-bg.scss

@@ -1,8 +1,7 @@
 // All-caps `RGBA()` function used because of this Sass bug: https://github.com/sass/node-sass/issues/2251
 @each $color, $value in $theme-colors {
-  $color-rgb: to-rgb($value);
   .text-bg-#{$color} {
     color: color-contrast($value) if($enable-important-utilities, !important, null);
-    background-color: RGBA($color-rgb, var(--#{$prefix}bg-opacity, 1)) if($enable-important-utilities, !important, null);
+    background-color: RGBA(var(--#{$prefix}#{$color}-rgb), var(--#{$prefix}bg-opacity, 1)) if($enable-important-utilities, !important, null);
   }
 }