ci: Don't run the coverage job in a separate stage

5 jobs for master in 15 minutes and 40 seconds (queued for 24 seconds)
Status Job ID Name Coverage
  Test
passed #279129
amd64 debian
asan-ubsan

00:08:35

passed #279128
amd64 debian
coverage

00:05:35

58.9%
passed #279125
amd64 debian
linux

00:07:04

passed #279126
win32
win32

00:09:31

failed #279127
win64
win64

00:06:29

 
Name Stage Failure
failed
win64 Test

[----------] Global test environment tear-down
[==========] 260 tests from 25 test cases ran. (255217 ms total)
[ PASSED ] 259 tests.
[ FAILED ] 1 test, listed below:
[ FAILED ] RemovalNotifierTests.DeleteBatch

1 FAILED TEST
ERROR: Job failed: exit code 1