feat: adapt treeland

[rb-union]

Adapt Treeland, disable kwayland-shell in
Treeland enviroment.

Log: Adapt Treeland.
Influence: Treeland

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在isTreeland函数中，使用了qEnvironmentVariable来检查环境变量，但没有考虑环境变量不存在的情况。
• 在main函数中，对Application::isWaylandPlatform()的调用后添加了!Application::isTreeland()的逻辑，但没有解释为什么需要这个额外的检查。
• DWIDGET_INIT_RESOURCE();在代码更改中移除，但没有提供移除的原因或替代方案。

是否建议立即修改:

• 是

[pengfeixx]

[是否满足兼容性要求] Y
[是否满足commit提交规范] Y
[是否满足编码规范] Y
[Review结论] Pass
[Fail原因] N/A

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: rb-union, starhcq

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