fix(cli): change the env files name in default template

[TheKonka]

#14979 #15009

这个 PR 做了什么? (简要描述所做更改)
修复设置环境变量无效问题

这个 PR 是什么类型? (至少选择一个)

• 错误修复(Bugfix) issue: fix 环境变量TARO_APP_ID无效 #14979 设置TARO_APP_ID不生效 #15009
• 新功能(Feature)
• 代码重构(Refactor)
• TypeScript 类型定义修改(Typings)
• 文档修改(Docs)
• 代码风格更新(Code style update)
• 其他，请描述(Other, please describe):

这个 PR 涉及以下平台:

• 所有小程序
• 微信小程序
• 支付宝小程序
• 百度小程序
• 字节跳动小程序
• QQ 轻应用
• 京东小程序
• 快应用平台（QuickApp）
• Web 平台（H5）
• 移动端（React-Native）
• 鸿蒙（harmony）

[Chen-jj]

@TheKonka 感谢贡献~

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.37%. Comparing base (f080a07) to head (b51196c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15328      +/-   ##
==========================================
- Coverage   58.67%   58.37%   -0.30%     
==========================================
  Files         489      489              
  Lines       21830    22142     +312     
  Branches     5612     5743     +131     
==========================================
+ Hits        12809    12926     +117     
- Misses       7841     8060     +219     
+ Partials     1180     1156      -24     

Flag	Coverage Δ
taro-cli	57.36% <ø> (-5.93%)	⬇️
taro-runner	46.21% <ø> (ø)
taro-runtime	65.35% <ø> (ø)
taro-web	40.61% <ø> (ø)

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see 12 files with indirect coverage changes