[FrameworkBundle] update debug commands references

With #11627, both the `ContainerDebugCommand` name and the
`ConfigDebugCommand` name have been moved to the `debug` namespace.
Thus, references should be updated accordingly.
[FrameworkBundle] Use debug namespace.
minor #13020 [FrameworkBundle] update debug commands references (xabbuh, aitboudad)

This PR was merged into the 2.6 branch.

Discussion
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[FrameworkBundle] update debug commands references

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #12939
| License       | MIT
| Doc PR        |

With #11627, both the `ContainerDebugCommand` name and the
`ConfigDebugCommand` name have been moved to the `debug` namespace.
Thus, references should be updated accordingly.

Commits
-------

c0925e4 [FrameworkBundle] Use debug namespace.
5847771 [FrameworkBundle] update debug commands references