fix(performance): change error threshold for steps test

[juliayakovlev]

Following discussions with Roy, the P99 read error threshold will be increased for steps 600K and 700K in both vnode and tablet tests.

Testing

• [ ]

PR pre-checks (self review)

• I added the relevant backport labels
• I didn't leave commented-out/debugging code

Reminders

• Add New configuration option and document them (in sdcm/sct_config.py)
• Add unit tests to cover my changes (under unit-test/ folder)
• Update the Readme/doc folder relevant to this change (if needed)

[soyacz]

how about #9887?

[juliayakovlev]

how about #9887?

@soyacz
Ah, I missed it .
@roydahan looks like this commit should be closed.
do you approve #9887?

[roydahan]

I didn't go over all results that are part of the changes in #9887.
I prefer to do it in small steps like here and merge this one for now.