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/calendar/components/CalendarEventRow.tsx

@@ -16,7 +16,6 @@ import { Card } from '@/ui/layout/card/components/Card';
 import { CardContent } from '@/ui/layout/card/components/CardContent';
 import { TimelineCalendarEvent } from '~/generated-metadata/graphql';
 import { CalendarChannelVisibility } from '~/generated/graphql';
-import { getImageAbsoluteURIOrBase64 } from '~/utils/image/getImageAbsoluteURIOrBase64';
 import { isDefined } from '~/utils/isDefined';
 
 type CalendarEventRowProps = {
@@ -163,7 +162,7 @@ export const CalendarEventRow = ({
               key={[participant.workspaceMemberId, participant.displayName]
                 .filter(isDefined)
                 .join('-')}
-              avatarUrl={getImageAbsoluteURIOrBase64(participant.avatarUrl)}
+              avatarUrl={participant.avatarUrl}
               placeholder={
                 participant.firstName && participant.lastName
                   ? `${participant.firstName} ${participant.lastName}`