[DataFactory]Added new features in version 4.15.0.0

[Jingshu923]

• Added WebActivity support for Service Principal :[Web] Add Swagger for Service Principal azure-rest-api-specs#12780

• Added PipelineEndpoint with version and DataPathAssignments fields in AzureMLExecutePipeline
  [AML] Add PipelineEndpoint with version and DataPathAssignments fields in AzureMLExecutePipeline azure-rest-api-specs#12744

• Added pipeline policy and Elapsed Time Metric Add pipeline policy and Elapsed Time Metric azure-rest-api-specs#12883

• Fixed WebActivity dynamic authentication Fix WebActivity dynamic authentication  azure-rest-api-specs#12384

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[Jingshu923]

/check-enforcer override

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[markcowl]

@Jingshu923 This looks ok, however, in the future, you may want to use a branch that runs the ci - we can help with this next time. Meanwhile, any ci failures will need to be addressed when this branch merges to master.