Remove tags that misuse the contepts of tags in Docker

[diemol]

🐛 Bug Report

For each release, we use tags in the form 4, 4.0 to refer to a Selenium version, or 92.0 to refer to a browser version.

These type of tags get overwritten for every release, therefore users get upgrades without noticing. Most of the time, they notice when something goes wrong, even if they have not done any changes to their pipeline. This is less than ideal.

Therefore, we will remove these tags from Docker Hub and we won't push them anymore. WIth that, users will need to specify the full tag to get a Docker image, e.g. 4.0.0-rc-1-prerelease-20210713 or 92.0-20210713. This will avoid undesired surprises in their pipelines and they will be in full control of what versions are being used.

This change won't be done for the 3.x releases, it will only affect the Grid 4, as it has not been fully released.

We nee to evaluate if we should remove the latest tag at some point.

[diemol]

Tags have been removed from Docker Hub and with the linked commit we are not pushing these tags anymore.