docs: rename app v2 to app di when talking about runtime v0 (backport #21329)

[mergify]

Description

I'll partially backport what's necessary

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Summary by CodeRabbit

• New Features

  • Introduced the SetPreBlocker method for improved block processing.

• Documentation

  • Updated documentation to reflect new terminology and configuration guidelines related to the dependency injection framework.
  • Enhanced clarity on the usage of the SetPreBlocker method and provided additional instructions for configuring applications.

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This is an automatic backport of pull request #21329 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 651868a has failed:

On branch mergify/bp/release/v0.52.x/pr-21329
Your branch is up to date with 'origin/release/v0.52.x'.

You are currently cherry-picking commit 651868a17.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   UPGRADING.md

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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