ci: remove megacheck linter (#195) #260

Job	Run time
go-versions / go-versions	4s
Windows, Go 1.23	1m 2s
Windows, Go 1.22	3m 8s
Windows, Go 1.18	52s
Linux, Go 1.18 / Unit Tests and Coverage	1m 3s
Linux, Go 1.18 / Contract Tests	25s
Linux, Go 1.18 / Benchmarks	4m 50s
Linux, Go 1.22 / Unit Tests and Coverage	1m 13s
Linux, Go 1.22 / Benchmarks	4m 44s
Linux, Go 1.22 / Contract Tests	20s
Linux, Go 1.23 / Contract Tests	29s
Linux, Go 1.23 / Benchmarks	4m 45s
Linux, Go 1.23 / Unit Tests and Coverage	1m 25s
	24m 20s

Provide feedback