Update ci pipeline metric

  - Update ci_pipeline_config_repository
  Service ping metric description

config/metrics/counts_28d/20210216175550_ci_pipeline_config_repository.yml

 ---
 data_category: operational
 key_path: usage_activity_by_stage_monthly.verify.ci_pipeline_config_repository
-description: Total Monthly Pipelines from templates in repository
+description: Monthly count of unique users creating pipelines from CI files in the repository
 product_section: ops
 product_stage: verify
 product_group: group::pipeline execution

config/metrics/counts_all/20210216175518_ci_pipeline_config_repository.yml

 ---
 data_category: optional
 key_path: counts.ci_pipeline_config_repository
-description: Total Pipelines from templates in repository
+description: Total Pipelines from CI files in repository
 product_section: ops
 product_stage: verify
 product_group: group::pipeline execution

config/metrics/counts_all/20210216175533_ci_pipeline_config_repository.yml

 ---
 data_category: optional
 key_path: usage_activity_by_stage.verify.ci_pipeline_config_repository
-description: Total Pipelines from templates in repository
+description: Total count of unique users creating pipelines from CI files in the repository
 product_section: ops
 product_stage: verify
 product_group: group::pipeline execution