Release process: Add instructions on Apache Reporter

[andygrove]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.

Could you add "adding a release to
https://reporter.apache.org/addrelease.html?arrow " to
release process of DataFusion and Ballista?
The release information is used to generate a template for
a board report.

FYI:
* Board Report Wizard: https://reporter.apache.org/wizard/?arrow
* A board report draft based on template generated by the
  Board Report Wizard: https://github.com/apache/arrow/pull/14357

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Additional context
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[andygrove]

#3893
apache/datafusion-ballista#401