Tagbot labels with 'update' if I contribute two versions of the same software (even if that software is new in EasyBuild)

[casparvl]

To be precise, I had:

• A PR that added one version (AladinDesktop-12.060-Java-17.eb)
• Then, I added another (AladinDesktop-12.060-GCCcore-13.2.0-Java-17.eb). The tag bot now automatically labeled with 'update', I guess because it found the previous commit in this same branch, and consider this an 'update' of that.
• Then, I removed (AladinDesktop-12.060-Java-17.eb) and the tagbot correctly labeled the PR as 'new' again.

Now, I guess this is a bit of a corner case, and I'm not sure if it is even a bug. That depends on what the design goal of the tag was, but I assume it is to check if it is new in the EasyBuild main/develop branches, not in my feature branch... I.e. I'm not sure if this is possible, but I guess it should check for prior existence in main/develop, and not the current (i.e. feature) branch.