Clean up unused number util method

This MR removes the recently added and unrequired
bytesToKB method

app/assets/javascripts/lib/utils/constants.js

 export const BYTES_IN_KIB = 1024;
-export const BYTES_IN_KB = 1000;
 export const HIDDEN_CLASS = 'hidden';
 export const TRUNCATE_WIDTH_DEFAULT_WIDTH = 80;
 export const TRUNCATE_WIDTH_DEFAULT_FONT_SIZE = 12;

app/assets/javascripts/lib/utils/number_utils.js

-import { BYTES_IN_KIB, BYTES_IN_KB } from './constants';
+import { BYTES_IN_KIB } from './constants';
 import { sprintf, __ } from '~/locale';
 
 /**
@@ -34,18 +34,6 @@ export function formatRelevantDigits(number) {
   return formattedNumber;
 }
 
-/**
- * Utility function that calculates KB of the given bytes.
- * Note: This method calculates KiloBytes as opposed to
- * Kibibytes. For Kibibytes, bytesToKiB should be used.
- *
- * @param  {Number} number bytes
- * @return {Number}        KiB
- */
-export function bytesToKB(number) {
-  return number / BYTES_IN_KB;
-}
-
 /**
  * Utility function that calculates KiB of the given bytes.
  *

spec/frontend/lib/utils/number_utility_spec.js

 import {
   formatRelevantDigits,
-  bytesToKB,
   bytesToKiB,
   bytesToMiB,
   bytesToGiB,
@@ -55,16 +54,6 @@ describe('Number Utils', () => {
     });
   });
 
-  describe('bytesToKB', () => {
-    it.each`
-      input   | output
-      ${1000} | ${1}
-      ${1024} | ${1.024}
-    `('returns $output KB for $input bytes', ({ input, output }) => {
-      expect(bytesToKB(input)).toBe(output);
-    });
-  });
-
   describe('bytesToKiB', () => {
     it('calculates KiB for the given bytes', () => {
       expect(bytesToKiB(1024)).toEqual(1);