[CI] Remove the CentOs tests as vae23 and 24 stable + frequent failure

Rational:
- was introduced because bare-metal OS on virgo and virgo2 is centOS + debian containers were not immediately available stable
- now both vae23 (debian10) and vae24 (debian11) are available and well established/used by CBM virgo users
- these two jobs were responsible for ~50% of all pipeline failures due to something hanging up in the load_libraries test at a cost of 2 x 900 s