[synapse] Mark 'sparkJobs' as nullable

[chamons]

System.Text.Json.JsonException : A property 'sparkJobs' defined as non-nullable but received as null from the service. This exception only happens in DEBUG builds of the library and would be ignored in the release build

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Changelog

Please ensure to add changelog with this PR by answering the following questions.

1. What's the purpose of the update?
   • new service onboarding
   • new API version
   • update existing version for new feature
   • update existing version to fix swagger quality issue in s360
   • Other, please clarify - Fix Azure SDK test failure due to C# nullability missing
2. When you are targeting to deploy new service/feature to public regions? Please provide date, or month to public if date is not available yet.
3. When you expect to publish swagger? Please provide date, or month to public if date is not available yet.
4. If it's an update to existing version, please select SDKs of specific language and CLIs that require refresh after swagger is published.
   • SDK of .NET (need service team to ensure code readiness)
   • SDK of Python
   • SDK of Java
   • SDK of Js
   • SDK of Go
   • PowerShell
   • CLI
   • Terraform
   • No, no need to refresh for updates in this PR

Contribution checklist:

• I commit to follow the Breaking Change Policy of “no breaking changes
• I have reviewed the documentation for the workflow.
• Validation tools were run on swagger spec(s) and errors have all been fixed in this PR. How to fix?

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ARM API Review Checklist

• Ensure to check this box if one of the following scenarios meet updates in the PR, so that label “WaitForARMFeedback” will be added automatically to involve ARM API Review. Failure to comply may result in delays for manifest application. Note this does not apply to data plane APIs, all “removals” and “adding a new property” no more require ARM API review.

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[openapi-workflow-bot]

Hi, @chamons Thanks for your PR. I am workflow bot for review process. Here are some small tips.

Please ensure to do self-check against checklists in first PR comment.

PR assignee is the person auto-assigned and responsible for your current PR reviewing and merging.

For specs comparison cross API versions, Use API Specs Comparison Report Generator

If there is CI failure(s), to fix CI error(s) is mandatory for PR merging; or you need to provide justification in PR comment for explanation. How to fix?

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[openapi-pipeline-app]

Swagger Validation Report

️️✔️BreakingChange succeeded [Detail] [Expand]

There are no breaking changes.

• Compared Swaggers (Based on Oad v0.8.5)
  • original: preview/2019-11-01-preview/monitoring.json <---> new: preview/2019-11-01-preview/monitoring.json

️️✔️LintDiff succeeded [Detail] [Expand]

Validation passes for LintDiff.

• Linted configuring files (Based on source branch, openapi-validator v1.6.0 , classic-openapi-validator v1.1.5 )
  • synapse/data-plane/readme.md tag:package-monitoring-2019-11-01-preview
• Linted configuring files (Based on target branch, openapi-validator v1.6.0 , classic-openapi-validator v1.1.5 )
  • synapse/data-plane/readme.md tag:package-monitoring-2019-11-01-preview

️️✔️Avocado succeeded [Detail] [Expand]

Validation passes for Avocado.

️️✔️ModelValidation succeeded [Detail] [Expand]

Validation passes for ModelValidation.

️️✔️SemanticValidation succeeded [Detail] [Expand]

Validation passes for SemanticValidation.

️️✔️[Staging] Cross Version BreakingChange (Base on preview version) succeeded [Detail] [Expand]

There are no breaking changes.

️️✔️[Staging] Cross Version BreakingChange (Base on stable version) succeeded [Detail] [Expand]

There are no breaking changes.

️️✔️CredScan succeeded [Detail] [Expand]

There is no credential detected.

_{Posted by Swagger Pipeline | How to fix these errors?}

[openapi-pipeline-app]

Swagger pipeline restarted successfully, please wait for status update in this comment.