Refresh ci minutes in ChangeNamespaceService

Ref: #329763 (closed)

What does this MR do?

This MR updates ci minutes any time we change the CI minutes limit for a given namespace.

Why are we doing this?

As brought up in !64443 (comment 638798140), where we refreshed cached ci minutes with the new architecture leveraging Ci::Minutes::AdditionalPacks.

We forgot to update this codepath, this MR takes care of it.

Does this MR meet the acceptance criteria?

Conformity

• [-] I have included changelog trailers, or none are needed. (Does this MR need a changelog?)
• [-] I have added/updated documentation, or it's not needed. (Is documentation required?)
• I have properly separated EE content from FOSS, or this MR is FOSS only. (Where should EE code go?)
• [-] I have added information for database reviewers in the MR description, or it's not needed. (Does this MR have database related changes?)
• I have self-reviewed this MR per code review guidelines.
• This MR does not harm performance, or I have asked a reviewer to help assess the performance impact. (Merge request performance guidelines)
• I have followed the style guides.
• This change is backwards compatible across updates, or this does not apply.