Is there currently a block capable of configuring access to an Azure Keyvault from within K8s job infrastructure ?

Not as a block, but you can do this using managed identity and code

I need my flows to be able to access the kayvault to retrieve various credentials for external APIs like fivetran and power bi

Unfortunately, there is not a tie-in block yet for vaults (keyvault / hashicorp / secrets manager) , but you can use the native code to do this in-flow like:

from azure.identity import DefaultAzureCredential, ManagedIdentityCredential
from azure.keyvault.secrets import SecretClient

# Set up the default credential, which uses the managed identity of the Azure resource (ACI, VM, etc.)
credential = DefaultAzureCredential(exclude_shared_token_cache_credential=True)

# Create a secret client using the default credential and the URL to the Key Vault
secret_client = SecretClient(vault_url="<https://mykeyvault.vault.azure.net>", credential=credential)

# Retrieve the secret
secret_name = "mysecret"
retrieved_secret = secret_client.get_secret(secret_name)

Got it. Thank you.