fix: cloud_controller_ng#4971

[b1tamara]

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• A short explanation of the proposed change: fix the issue Not clear error message for hash-based misconfigured route #4971

Output during cf push with my change:

    buildpacks:
      nodejs_buildpack
+   routes:
+   - options:
+       loadbalancing: hash
+     route: hash-invalid.cfapps.aws-cfn07.aws.cfn.sapcloud.io
+   - options:
+       hash_balance: 1.25
+       loadbalancing: hash
+     route: hash-no-header.cfapps.aws-cfn07.aws.cfn.sapcloud.io
+   - options:
+       hash_header: hash-header
+       loadbalancing: hash
+     route: hash-no-balance.cfapps.aws-cfn07.aws.cfn.sapcloud.io
  version: 1
For application 'retry-test': For route 'hash-invalid.cfapps.aws-cfn07.aws.cfn.sapcloud.io': Hash header must be present when loadbalancing is set to hash.

• Links to any other associated PRs: related to hash-based routing implementation in PR#4746

• I have reviewed the contributing guide

• I have viewed, signed, and submitted the Contributor License Agreement

• I have made this pull request to the main branch

• I have run all the unit tests using bundle exec rake

• I have run CF Acceptance Tests