chore: add merge state status for better visibility why a pull request was not merged

[Eun]

Description

Problem

Its hard to see why a pull request is marked as not mergable. (Could also be the reason for #25)

Solution

Also fetch MergeStateStatus and add it to the log output and final check message that gets sent to github

Notes

Other notes that you want to share but do not fit into Problem or Solution.

[coveralls]

Pull Request Test Coverage Report for Build 7130109267

• 0 of 4 (0.0%) changed or added relevant lines in 1 file are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage remained the same at 22.889%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/merge-with-label/worker/should_skip.go	0	4	0.0%

Files with Coverage Reduction	New Missed Lines	%
pkg/merge-with-label/worker/push_woker.go	2	0.0%

Totals
Change from base Build 7129921145:	0.0%
Covered Lines:	206
Relevant Lines:	900

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💛 - Coveralls