Fix install page context, make the install page tests really test #24858
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Fix #24856
Rename "context.contextKey" to "context.WebContextKey", this context is for web context only. But the Context itself is not renamed, otherwise it would cause a lot of changes (if we really want to rename it, there could be a separate PR).
The old test code doesn't really test, the "install page" gets broken not only one time, so use new test code to make sure the "install page" could work.