Add GitHub issue templates and exclude .vscode-test.json from VSIX

[Copilot]

Users reporting marketplace installation failures had no structured way to provide environment details. Added issue templates per request, modeled after vscode-fixcnchar.

• Issue templates (.github/ISSUE_TEMPLATE/):
  • bug-report.yml — VS Code version, extension version, OS, repro steps, expected behavior
  • feature-request.yml — description, proposed solution, alternatives
  • general-question.yml — checklist + question field
  • config.yml — disables blank issues
• Packaging: added .vscode-test.json to .vscodeignore

Original prompt

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This section details on the original issue you should resolve

<issue_title>vscode插件市场安装失败</issue_title>
<issue_description>请修复问题

[error] [窗口] End of central directory record signature not found. Either not a zip file, or file is truncated.: Error: End of central directory record signature not found. Either not a zip file, or file is truncated.
    at Ob (file:///c:/work/tool/Microsoft%20VS%20Code%20Insiders/c2da2674e1/resources/app/out/vs/code/electron-utility/sharedProcess/sharedProcessMain.js:450:28625)
    at file:///c:/work/tool/Microsoft%20VS%20Code%20Insiders/c2da2674e1/resources/app/out/vs/code/electron-utility/sharedProcess/sharedProcessMain.js:450:29929
    at c:\work\tool\Microsoft VS Code Insiders\c2da2674e1\resources\app\node_modules\yauzl\index.js:40:7
    at c:\work\tool\Microsoft VS Code Insiders\c2da2674e1\resources\app\node_modules\yauzl\index.js:190:5
    at c:\work\tool\Microsoft VS Code Insiders\c2da2674e1\resources\app\node_modules\yauzl\index.js:712:5
    at c:\work\tool\Microsoft VS Code Insiders\c2da2674e1\resources\app\node_modules\yauzl\fd-slicer.js:33:7
    at FSReqCallback.wrapper [as oncomplete] (node:fs:671:5)

添加issue_template 参考 https://github.com/tlcsdm/vscode-fixcnchar</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes vscode插件市场安装失败 #54

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