Rename top-priority to working session

[bjohansebas]

As already mentioned, we should rename 'top-priority' to 'working session' or something similar, as the name 'top-priority' is not appropriate since there are things discussed in the working sessions that are not top priority.

This change has to be made by a TC member, as they are the only ones with write access to the repositories.

The easiest way is to create a script for this since there are too many repositories.

• rename label
• Change the label name in the automation (

  discussions/.github/workflows/meetings.yml

  Line 34 in b6a317f

  agendaLabel: 'top priority'

  )