Release CI improvements bag

[pmalek]

Sub-issues:

• [x] #3350
• [x] #3348
• [x] #3331
• [ ] #3349
• [ ] Promotion enabler: #3357

Things to consider

• Running e2e pipelines (that prepare nightly "release candidates" for promotion) on release branches on every commit (no need to run every night on branches where nothing changes for months)