codspeed: too many benchmarks in a single upload

[cakebaker]

codspeed started to show the following error (see, for example, #11914):

Too many benchmarks in a single upload
The performance report could not be generated because there were too many benchmarks 
in a single upload to CodSpeed. We recommend sharding your benchmarks into smaller 
uploads, with max 1000 benchmarks per upload. See the documentation for more 
information.

[oech3]

#11526 (comment)

[oech3]

Drop RAM bench again...

[xtqqczze]

Closed by #11914 (comment)