Hide extension list in issues under <details> tag

[usernamehw]

• VSCode Version: Code - Insiders 1.20.0-insider (f911534, 2017-12-21T16:36:58.030Z)
• OS Version: Windows_NT x64 10.0.16299
• Extensions

  Extension	Author (truncated)	Version
  vscode-docker	Pet	0.0.22
  githistory	don	0.2.3
  tstools	iBo	1.1.3
  docthis	joe	0.6.0
  restructuredtext	lex	47.0.0
  code-beautifier	mic	1.7.2
  debugger-for-chrome	msj	4.0.0
  typescript-hero	rbb	1.8.0
  java	red	0.16.0
  vscode-icons	rob	7.19.0
  sonarqube-inject	sil	1.3.1
  autoimport	ste	1.5.3
  vscode-java-debug	vsc	0.5.0
  vscode-java-pack	vsc	0.2.0
  ReactSnippets	xab	1.7.0
  markdown-pdf	yza	0.1.7
  markdown-all-in-one	yzh	0.11.2

Steps to Reproduce:

Reproduces without extensions: Yes/No

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Use cases:

• Issue that doesn't give any useful information (only title notign Works!!!Fix!)
• Known issue of the release
• Known issue in general
• Author specified Reproduces without extensions: Yes
• Less visual noise in any way

[Tyriar]

@octref I think you were working on the new issue reporting stuff so I guess this should go to you. Tbh I'm not sure if this is good or bad as people could potentially gloss over the fact that the report has extensions active.