[ML] Remove blank job definition as it is unused and out-of-sync with…

… Elasticsearch (#102506)

This a companion to elastic/elasticsearch#74188.

This PR is functionally a no-op, as the removed method
was not called anywhere. But it is sensible to remove
it to prevent it being called in the future now that it
references fields that don't exist in Elasticsearch.

x-pack/plugins/ml/public/application/services/job_service.js

@@ -91,26 +91,6 @@ class JobService {
     };
   }
 
-  getBlankJob() {
-    return {
-      job_id: '',
-      description: '',
-      groups: [],
-      analysis_config: {
-        bucket_span: '15m',
-        influencers: [],
-        detectors: [],
-      },
-      data_description: {
-        time_field: '',
-        time_format: '', // 'epoch',
-        field_delimiter: '',
-        quote_character: '"',
-        format: 'delimited',
-      },
-    };
-  }
-
   loadJobs() {
     return new Promise((resolve, reject) => {
       jobs = [];