add managed identity support to azure container registry hook

[Lee-W]

---

^ Add meaningful description above
Read the Pull Request Guidelines for more information.
In case of fundamental code changes, an Airflow Improvement Proposal (AIP) is needed.
In case of a new dependency, check compliance with the ASF 3rd Party License Policy.
In case of backwards incompatible changes please leave a note in a newsfragment file, named {pr_number}.significant.rst or {issue_number}.significant.rst, in newsfragments.

[potiuk]

Hey @Lee-W - I merged all the small pull requests for Azure - but I have one kind request after I've done that (actually two):

1. Is it possible to think about some kind of refactoring that will make all those changes reuse the very similar code of configuration

2. Is it possible to add unit tests covering all those togeher with this refactor?

That could be a single PR doing all that in one go for all the azure properties with manage identity.

Could you please work on such a PR now that all others are merged ?

[Lee-W]

1. Is it possible to think about some kind of refactoring that will make all those changes reuse the very similar code of configuration

Sure. I think I've done the get_defaul_azure_credential part, but the ui part might be something doable as wel..

2. Is it possible to add unit tests covering all those togeher with this refactor?

Sure. I'll improve the coverage in that PR

That could be a single PR doing all that in one go for all the azure properties with manage identity.

Could you please work on such a PR now that all others are merged ?

Should I create a new PR after this is merged? or do you want me to add them in this PR

[potiuk]

Should I create a new PR after this is merged? or do you want me to add them in this PR

Aftere that one is fine :)