remove scalastyle plugin

[larshagencognite]

scalastyle is abandoned for +5 years, and is making it difficult to maintain updates

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.12%. Comparing base (6d308a4) to head (c72464e).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #737   +/-   ##
=======================================
  Coverage   82.12%   82.12%           
=======================================
  Files          99       99           
  Lines        2881     2881           
  Branches       29       29           
=======================================
  Hits         2366     2366           
  Misses        515      515           

Files	Coverage Δ
...in/scala/com/cognite/sdk/scala/common/OAuth2.scala	91.30% <ø> (ø)
...in/scala/com/cognite/sdk/scala/common/filter.scala	82.35% <ø> (ø)
...c/main/scala/com/cognite/sdk/scala/v1/Client.scala	82.27% <ø> (ø)
...com/cognite/sdk/scala/v1/dataModelProperties.scala	10.20% <ø> (ø)
.../v1/fdm/common/properties/PropertyDefinition.scala	87.50% <ø> (ø)
...dk/scala/v1/fdm/instances/InstanceDefinition.scala	77.77% <ø> (ø)
...n/scala/com/cognite/sdk/scala/v1/propertyMap.scala	0.00% <ø> (ø)
...om/cognite/sdk/scala/v1/resources/dataPoints.scala	93.14% <ø> (ø)
...scala/com/cognite/sdk/scala/common/dataTypes.scala	83.92% <75.00%> (ø)

[github-actions]

This pull request seems a bit stale.. Shall we invite more to the party?

[dmivankov]

Let's drop, some replacement linters or formatters could be looked into but there's already wartremover and scalafmt configured in this repo, so at least something is still in place