Improve performance of demo workspace - Rename getImageAbsoluteURIOrBase64 function (#6282)

### Description

1. This PR is a continuation of a previous PR:
https://github.com/twentyhq/twenty/pull/6201#pullrequestreview-2175601222

2. One test case was removed here:
`packages/twenty-front/src/utils/image/__tests__/getImageAbsoluteURI.test.ts`
because since we are not handling base64 images anymore, the result is
the same of the last test case. Would you rather we update the test
instead?


### Refs

- #3514
- https://github.com/twentyhq/twenty/pull/6201

### Demo


https://www.loom.com/share/4f32b535c77a4d418e319b095d09452c?sid=df34adf8-b013-44ef-b794-d54846f52d2d

Fixes #3514

---------

Co-authored-by: gitstart-twenty <gitstart-twenty@users.noreply.github.com>

packages/twenty-front/src/modules/workspace/components/WorkspaceMemberCard.tsx

@@ -2,7 +2,6 @@ import styled from '@emotion/styled';
 import { Avatar, OverflowingTextWithTooltip } from 'twenty-ui';
 
 import { WorkspaceMember } from '@/workspace-member/types/WorkspaceMember';
-import { getImageAbsoluteURIOrBase64 } from '~/utils/image/getImageAbsoluteURIOrBase64';
 
 const StyledContainer = styled.div`
   background: ${({ theme }) => theme.background.secondary};
@@ -39,7 +38,7 @@ export const WorkspaceMemberCard = ({
 }: WorkspaceMemberCardProps) => (
   <StyledContainer>
     <Avatar
-      avatarUrl={getImageAbsoluteURIOrBase64(workspaceMember.avatarUrl)}
+      avatarUrl={workspaceMember.avatarUrl}
       placeholderColorSeed={workspaceMember.id}
       placeholder={workspaceMember.name.firstName || ''}
       type="squared"