Support Token expiry longer than 86400s for OIDC Identity mappings

[juannfox]

Is your feature request related to a problem? Please describe.
The oidc_identity_mapping resource limits the Token expiry to 86400 seconds. This is not accurate to what the Access API really supports, as the access-config.yaml file allows administrators to extend this duration as desired, throught the following YAML instruction:

security:
  oidc:
    max-expiry-seconds: 2592000 # Example of a supported value above 86400

In short, the Terraform provider is restricting the user's choice beyond what the Access API really supports.

Describe the solution you'd like
The maximum duration of 86400 seconds enforced today should be removed or updated to support the maximum Token duration applied for any other Access Token.