[Platform] Ability to specify default gflag values for Platform universes

[iSignal]

Gflag values have default values that are specified in (C++) code. We want to be able to specify a different default from the C++ code default for certain gflags for dbs set up through Platform.

For example, we want to set the gflag fail_on_out_of_range_clock_skew=false for Platform universes though it is set to true in OSS universes. This is because we want to handle clock skew issues through alerts rather than crashes in the Platform case.

This will involve:

1. Set the gflag to this value for newly created Platform universes for VMs
2. Set the gflag to this value for newly created k8s universes > certain version when this gflag was introduced.
   This is because unknown gflags cause k8s yb processes to crash (VMs use conf files instead). We can avoid this logic by fixing [k8s] [YW] Use flagfile to specify gflags to yb-master/tserver in helm chart #6684
3. Set the gflag to this value when an already created VM universe is upgraded through this Platform (software upgrade).
4. Set the gflag to this value when an already created k8s universe is upgraded through this Platform (software upgrade)

For the k8s work, we will also need to complete the helm chart versioning work (#8950).

@jvigil-yugabyte @bmatican @streddy-yb