fix(ux): Improve libzypp callbacks

[lslezak]

Problem

• UI/UX: Improve libzypp error callbacks #1985
• The current UI is not much intuitive 😟
  

Solution

• Better button labels (now even translated!)
• "Try again" is now the default
• Display a title to have a context
• Describe the consequences of skipping package installation
• @dgdavid proposed even more enhancements (see his comment), but that would require non trivial enhancements

Notes

• This is not a perfect solution, the current Query API is quite limited
• I'll create a new card for enhancing the API to allow some more features (and remove the current workarounds)

Testing

• Tested manually

Screenshots

[coveralls]

Pull Request Test Coverage Report for Build 13386011811

Details

• 31 of 33 (93.94%) changed or added relevant lines in 4 files are covered.
• 43 unchanged lines in 7 files lost coverage.
• Overall coverage increased (+0.06%) to 70.837%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
service/lib/agama/software/callbacks/base.rb	13	14	92.86%
service/lib/agama/software/callbacks/provide.rb	8	9	88.89%

Files with Coverage Reduction	New Missed Lines	%
service/lib/agama/software/callbacks/progress.rb	1	68.89%
service/service/lib/agama/software/callbacks/provide.rb	1	94.44%
service/lib/agama/storage/finisher.rb	2	98.55%
service/service/lib/agama/storage/finisher.rb	2	98.55%
service/service/lib/agama/software/callbacks/progress.rb	7	68.89%
service/lib/agama/manager.rb	15	81.89%
service/service/lib/agama/manager.rb	15	81.89%

Totals
Change from base Build 13369642019:	0.06%
Covered Lines:	17771
Relevant Lines:	25087

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💛 - Coveralls

[dgdavid]

Taking a look to the screenshots in the description

• I'd not use icon as part of the title But using it does not hurt and it is ok. Moreover, you have used the one used in the installation button when there are issues, which is great in terms of consistence.
• I'd try to keep the buttons order. I.e, not adding the abort installation in the middle of the other two, which changes the order of buttons.
• I'd use a "tertirary" or "plain" variant for the "Abort installation" action, if possible. Also, I'd add the "isDanger" prop.

[imobachgs]

Just some minor things. Otherwise, it looks much better now.

[lslezak]

• I'd use a "tertirary" or "plain" variant for the "Abort installation" action, if possible. Also, I'd add the "isDanger" prop.

This is a bit tricky. The problem is that the only safe option is "Try again".

Both "Continue anyway" and "Abort installation" can result in a broken or not bootable system. Although skipping a package feels a bit less dangerous in the end it does not matter if your system does not boot because of a single missing package or two dozens.

I do not want to create a false impression that skipping a package is a safe option. It's not. It's equally dangerous as aborting the installation.

Moreover this change would require non trivial enhancement of the QuestionActions component to allow specifying "danger" actions. And I'd postpone that for later, I think the current implementation is good enough.

[dgdavid]

Let's merge it, thank you