Upgrade composer v1 to composer v2 for php 7.4

[rsereir]

Current version for php 7.4 is not compatible with composer v2.0

[edbizarro]

can you remove hirak/prestissimo from the images with composer v2 too?

thanks

[rsereir]

I removed this image from all php versions with composer v2, thanks for review.

[GlennM]

PR #113 has been merged, so can this one about Composer v2 be completed now?

[jacobnollette]

Any info on the conflicts?

[evs-xsarus]

Could this be added in such a way that I can choose to have composer 1 or 2 ?

Perhaps keep the current for composer 1

image: edbizarro/gitlab-ci-pipeline-php:7.4

and for composer 2:

image: edbizarro/gitlab-ci-pipeline-php:7.4-composer2