[PR #8831/2ae41fa8 backport][stable-8] keycloak_user_federation: get the before mappers from `before_comp` to fix `UnboundLocalError`

[patchback[bot]]

This is a backport of PR #8831 as merged into main (2ae41fa83f44aefce38cd845e377dcdd73b9f32b).

SUMMARY

The module crashes if an id is provided for a mapper, see https://github.com/ansible-collections/community.general/pull/8695#issuecomment-2331251238.

The before mappers should be retrieved from the before_comp not before_mapper.

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

community.general.keycloak_user_federation

ADDITIONAL INFORMATION

1. create a mapper without providing an id:

   mappers:
   - name: "first name"
   providerId: "user-attribute-ldap-mapper"
   providerType: "org.keycloak.storage.ldap.mappers.LDAPStorageMapper"
   config:
     ldap.attribute: givenName
     read.only: true
     write.only: false
     attribute.force.default: true
     is.mandatory.in.ldap: true
     is.binary.attribute: false
     user.model.attribute: firstName

2. copy id from keycloak and update mapper:

   mappers:
   - name: "first name"
   id: f2d82dec-923c-40da-a9f7-0fe83ca8c009
   providerId: "user-attribute-ldap-mapper"
   providerType: "org.keycloak.storage.ldap.mappers.LDAPStorageMapper"
   config:
     ldap.attribute: givenName
     read.only: true
     write.only: false
     attribute.force.default: true
     is.mandatory.in.ldap: true
     is.binary.attribute: false
     user.model.attribute: firstName

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