Fix ambiguity of IEnumerable/IAsyncEnumerable for DelayedQuery

[SergeiPavlov]

Follow up of #170

See the build ambiguity of .Select()
https://teamcity.st.dev/buildConfiguration/Services_ServiceTitan_DockerImageBuildAndPublishDevelopment/4042188?hideProblemsFromDependencies=false&hideTestsFromDependencies=false&expandBuildProblemsSection=true&expandBuildChangesSection=true

[snaumenko-st]

I'm afraid that if we end up with this fix, we would not be able to easily fix issues related to implicit use of DelayedQuery as IEnumerable in the app.

[SergeiPavlov]

I'm afraid that if we end up with this fix, we would not be able to easily fix issues related to implicit use of DelayedQuery as IEnumerable in the app.

That is Ok for our App

1. But I'm afraid the IAsyncEnumerable on DelayedQuery #170 PR to the Upstream DO repo will be declined as a breaking change.
   And our fork will diverge even more with it.

2. We have a build issue with Threading Analyzer: error VSTHRD200: Use "Async" suffix in names of methods that return an awaitable type
   Because DelayedQuery is awaitable now