Purge cache in one place #3699

we delete all cache in s3 in one place (opencloud ci) using cron.
example https://ci.opencloud.rocks/repos/3/pipeline/4066/2
#3691

need delete purge-cache:

• opencloud stable-7.2 [stable-7.2] ci: remove per-repo S3 cache purge. run save-pipeline-info inside build-opencloud #3697
• web main remove purge cache step web#3647
• web stable-7.1 [stable-7.1] ci: remove purge cache step web#3652
• reva main delete purge cache step reva#870
• reva stable- [stable-2.46] ci: remove purge cache step reva#871
• web-extension - not needed
• desktop @saw-jan : ci: remove redundant cache purge workflow desktop#1166
• opencloud-charts - not needed