Are ci-packages versions in versions.yaml no longer relevant for Conan packages?

In `versions.yaml` the `ci-packages` versions lists specific package versions, are those relevant for Conan packages, and can they be removed one the last packages are converted from Docker "packages" to Conan packages?

```
ci-packages:
clang:
- "1-clang6.2"
- "1-clang7.2"
- "1-clang8.2"
- "1-clang9.2"
- "1-clang10.2"
- "2-clang10.3"
- "2-clang11.4"
- "2-clang12.1"
- "2-clang13.1"
- "2-clang14.0"
- "3-clang14.2"
- "3-clang15.2"
- "4-clang16.4"
- "4-clang17.4"
- "5-clang18.3"
- "5-clang19.3"
- "6-clang19.1"
- "6-clang20.1"
ninja:
- "1.3"
- "2.2"
- "3.2"
- "4.4"
- "5.3"
- "6.1"
cmake:
- "1.3"
- "2.2"
...
```

Start by reading versions.yaml and tracing where the ci-packages versions are consumed. Compare those uses with the remaining Docker-to-Conan package conversions, then determine whether the entries are still required. Done means the relevance is established and obsolete entries are removed only if no remaining package workflow depends on them.

Written by the indexing model from the issue text.