[GEN-1557] Add prod sampler new api (#1631)

This pull request introduces a new `ProbabilisticSamplerAction` to the
codebase, along with the necessary updates to support its creation,
update, and deletion. The key changes include adding the new action
type, updating the GraphQL schema, and implementing the corresponding
service functions.

### Addition of `ProbabilisticSamplerAction`:

*
[`frontend/graph/model/models_gen.go`](diffhunk://#diff-642ccd7ed71fdfa394bd7f7fd99c9c33e20ff18c876a91cb989d379a44390469R311-R337):
Added the `ProbabilisticSamplerAction` struct and its methods to the
model.
*
[`frontend/graph/schema.graphqls`](diffhunk://#diff-bc07b91dedd1782d9ddbbb6374ad97c7604f9a267de5174645723d863c732f80R309-R318):
Updated the GraphQL schema to include the `ProbabilisticSamplerAction`
type.

### Resolver Updates:

*
[`frontend/graph/schema.resolvers.go`](diffhunk://#diff-8e6e95029056db2c0301fc338e0ca5a04356ce5d45ee9514bbd167f2d85bae70L568-R571):
Updated the `CreateAction`, `UpdateAction`, and `DeleteAction` resolvers
to handle the new `ProbabilisticSamplerAction` type.
[[1]](diffhunk://#diff-8e6e95029056db2c0301fc338e0ca5a04356ce5d45ee9514bbd167f2d85bae70L568-R571)
[[2]](diffhunk://#diff-8e6e95029056db2c0301fc338e0ca5a04356ce5d45ee9514bbd167f2d85bae70L586-R591)
[[3]](diffhunk://#diff-8e6e95029056db2c0301fc338e0ca5a04356ce5d45ee9514bbd167f2d85bae70L617-R630)

### Constants Update:

*
[`frontend/services/actions/constants.go`](diffhunk://#diff-377602090c56364ea3a4d6cdadda1ad9b1c6ba9e122f882e5a1f640b1e62acf8L8-R9):
Added `ActionTypeProbabilisticSampler` and corrected the naming of
`ActionTypeLatencySampler`.

### Service Implementation:

*
[`frontend/services/actions/probabilisticsampler.go`](diffhunk://#diff-2f6dc14f04b67e0a11a5b999216a0e08f575927294c5033187b84f1179fb5624R1-R139):
Implemented the service functions `CreateProbabilisticSampler`,
`UpdateProbabilisticSampler`, and `DeleteProbabilisticSampler` to manage
`ProbabilisticSamplerAction` in Kubernetes.