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/activities/emails/components/EmailThreadPreview.tsx

@@ -10,7 +10,6 @@ import { CardContent } from '@/ui/layout/card/components/CardContent';
 import { useRightDrawer } from '@/ui/layout/right-drawer/hooks/useRightDrawer';
 import { MessageChannelVisibility, TimelineThread } from '~/generated/graphql';
 import { formatToHumanReadableDate } from '~/utils/date-utils';
-import { getImageAbsoluteURIOrBase64 } from '~/utils/image/getImageAbsoluteURIOrBase64';
 
 const StyledCardContent = styled(CardContent)<{
   visibility: MessageChannelVisibility;
@@ -154,24 +153,20 @@ export const EmailThreadPreview = ({
       <StyledHeading unread={!thread.read}>
         <StyledParticipantsContainer>
           <Avatar
-            avatarUrl={getImageAbsoluteURIOrBase64(
-              thread?.firstParticipant?.avatarUrl,
-            )}
+            avatarUrl={thread?.firstParticipant?.avatarUrl}
             placeholder={thread.firstParticipant.displayName}
             type="rounded"
           />
           {thread?.lastTwoParticipants?.[0] && (
             <StyledAvatar
-              avatarUrl={getImageAbsoluteURIOrBase64(
-                thread.lastTwoParticipants[0].avatarUrl,
-              )}
+              avatarUrl={thread.lastTwoParticipants[0].avatarUrl}
               placeholder={thread.lastTwoParticipants[0].displayName}
               type="rounded"
             />
           )}
           {finalDisplayedName && (
             <StyledAvatar
-              avatarUrl={getImageAbsoluteURIOrBase64(finalAvatarUrl)}
+              avatarUrl={finalAvatarUrl}
               placeholder={finalDisplayedName}
               type="rounded"
               color={isCountIcon ? GRAY_SCALE.gray50 : undefined}