[C#]: 去除运行 PCL-CE 2.15.x 后提示的“PCL CE 将使用 .NET 10”提示

[Rain-Clear]

检查项 / Checklist

• 我已在 Issues 页面 中搜索，确认了这一建议未在社区版被提交过 / I have searched the Issues page and confirmed that this suggestion has not been submitted to the Community Edition yet.
• 我确认只是全部选中而没有仔细确认就直接提交了这个 Issue，并且同意这个 Issue 可以直接被关闭 / I confirm that I checked all boxes without carefully reading them, and agree that this issue may be closed directly.
• 我确认我所描述的改进是现实的、有理有据的，而不是我临时起意的 / I confirm that the improvement I describe is realistic, reasonable, and well-justified, rather than something I came up with on a whim.
• 我已知悉社区不对这类 Issue 的完成时间作出任何保证，并有足够的耐心等待社区开发者的处理，同时已知悉如果我作出催促、质问或类似的举动，这个 Issue 可能会被直接关闭 / I understand that the community does not guarantee any completion time for this type of issue, and I am willing to wait patiently for the community developers' review and handling. I also understand that excessive urging, demanding, or similar behavior may result in this issue being closed.

描述 / Description

根据 PCL CE 的行为，下载 PCL CE 2.15.0 后，若尝试运行，PCL CE 会首先检测是否安装了 .NET 10，若安装好则继续运行，若未安装则弹窗提示用户下载安装。
理论上来说此逻辑只在初次运行时进行一次就好，但程序内仍有此步骤。提示“如果你还未安装 .NET 10 桌面运行时，建议下载安装”。
等等我不是刚下的 .NET 吗怎么还有这个提示

原因 / Reason

这可以精简 PCL CE 的启动及初始化逻辑，减少不必要的提示。

[Pigeon0v0]

会直接把这个公告删掉