Show dialog when active contributors per month limit is hit

[ValentinBuira]

This PR add a new dialog when user try to sync while they have already hit the active contributor per month limit

Note for reviewer the error live and is triggered in synchronizationerror and synchronizationmanager

Resolve https://github.com/orgs/MerginMaps/projects/15/views/1?pane=issue&itemId=86203521

[github-actions]

Pull Request Test Coverage Report for Build 12008537298

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 181 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.02%) to 60.376%

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Files with Coverage Reduction	New Missed Lines	%
input/core/merginapi.h	1	97.56%
input/app/mmstyle.h	50	1.94%
input/core/merginapi.cpp	130	78.51%

Totals
Change from base Build 11788282153:	-0.02%
Covered Lines:	7876
Relevant Lines:	13045

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💛 - Coveralls

[VitorVieiraZ]

Looks good to me. I’ve left only comments about code styling and a suggestion for when apiSupportsSubscriptions is false.

[VitorVieiraZ]

Fix tests

[tomasMizera]

Just a tiny change, feel free to merge once adjusted 👍🏻 Thanks!

[tomasMizera]

Fix tests

... aand yes, we will need to fix tests in case they will still be failing once the CI is re-run

[tomasMizera]

We need revert here @ValentinBuira