Stabilize Sentinel tests - refine failover-timeout & tilt-period (#10518)

Sentinel once in a while experience Sentinel TILT period or leader election 
failure cycle. The problem is that those default timeout are too big and once 
it happens, it breaks our tests.  Suggesting:
- Reducing failover-timeout from 20 to 10sec (actually it is multiplied by 2 
  and reach 40sec of timeout) 
- Modify tilt-period from default of 30sec to 5sec. When TILT period happens 
  it might lead to failover in our tests, and might cause also to failover cycle
  cycle failure.

Sentinel tests should `wait_for_condition` up to 50seconds, where needed, 
to be stable in case having single TILT period or failover failure cycle.

In addition relax timing configuration for "manual failover" Sentinel test 
(was modified several months ago as part of an effort to reduce tests runtime)

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