feat: implement some libzypp error callbacks

[imobachgs]

Problem

Agama only implements a few libzypp error callbacks, so many times it does not report problems
properly.

Solution

Implement more libzypp error callbacks, reporting more types of problems.

• DoneProvide
• SourceProbeError
• SourceCreateError
• ScriptProblem

Testing

• Added a new unit test

Future

• AcceptUnknownGpgKey
• AcceptVerificationFailed
• AcceptFileWithoutChecksum
• AcceptWrongDigest
• AcceptUnknownDigest

[coveralls]

Pull Request Test Coverage Report for Build 12908783837

Details

• 94 of 103 (91.26%) changed or added relevant lines in 6 files are covered.
• 3 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.2%) to 71.037%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
service/lib/agama/software/callbacks/provide.rb	31	32	96.88%
service/lib/agama/software/callbacks/script.rb	21	22	95.45%
service/lib/agama/software/callbacks/source.rb	34	41	82.93%

Files with Coverage Reduction	New Missed Lines	%
service/lib/agama/software/callbacks/progress.rb	1	90.48%
service/service/lib/agama/software/callbacks/progress.rb	2	90.48%

Totals
Change from base Build 12894451227:	0.2%
Covered Lines:	17426
Relevant Lines:	24531

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💛 - Coveralls

[jreidinger]

NP: I think it would be better to use constants like IGNORE and RETRY in code instead of C or I.