What does this PR do?

This PR fixes config of the LANGFUSE_INIT_PROJECT_RETENTION and LANGFUSE_MAX_HISTORIC_EVAL_CREATION_LIMIT via env.
coerce was missing on both env vars. It seems all other number() envs use this, so it was probably an oversight that it was not added.

When setting up retention in our chart, Langfuse fails to validate the env var LANGFUSE_INIT_PROJECT_RETENTION when configured in additionalEnv as follows:

additionalEnv:
  - name: LANGFUSE_INIT_PROJECT_RETENTION
    value: "14"

Langfuse logs these errors when attempting to start:

Error: An error occurred while loading instrumentation hook: Invalid environment variables
LANGFUSE_INIT_PROJECT_RETENTION: [ 'Expected number, received string' ]

Note that setting the value unquoted results in a parsing error in helm:

✗ Helm upgrade failed for release langfuse/langfuse with chart langfuse@1.3.1: failed to create resource: Deployment in version "v1" cannot be handled as a Deployment: json: cannot unmarshal number into Go struct field EnvVar.spec.template.spec.containers.env.value of type string

While in here, I found that LANGFUSE_MAX_HISTORIC_EVAL_CREATION_LIMIT will suffer from the same issue, so I've also fixed that.

Type of change

• Bug fix

Mandatory Tasks

• Make sure you have self-reviewed the code. A decent size PR without self-review might be rejected.