Editor Extensions: add the next two IDE troubleshooting pages

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• Link to the merge request that introduced the new page:
  • Visual Studio: port over user docs (gitlab!163404 - merged)
  • JetBrains extension: port over external docs (gitlab!163070 - merged)
• Give the MR a descriptive title.
• The new pages:
  • https://docs.gitlab.com/ee/editor_extensions/visual_studio/visual_studio_troubleshooting.html
  • https://docs.gitlab.com/ee/editor_extensions/jetbrains_ide/jetbrains_troubleshooting.html

Related to

• Related to https://gitlab.com/gitlab-org/editor-extensions/meta/-/issues/110+ which tracks the overarching work
• Related to TW Coverage for Amy Qualls from 2024-08-26 unti... (technical-writing#1081 - closed) because I have it listed as a task to complete
• Related to Visual Studio: port over user docs (gitlab!163404 - merged) which brought the Visual Studio docs
• Related to JetBrains extension: port over external docs (gitlab!163070 - merged) which brought the JetBrains docs