Use github.repository for codecov upload target #3029

Job	Run time
env-protect-setup	8s
authorize	3s
get-dev-image / get-image	7s
generate-matrix	2m 47s
clang-tidy	1m 1s
code-coverage	0s
build-and-test (Go race detector, nokvm, --config=go_race --compilation_mode=opt, bazel_buildable...	13m 48s
build-and-test (Clang opt + UI, nokvm, --config=clang --compilation_mode=opt, bazel_buildables_cl...	30m 31s
build-and-test (Clang debug, nokvm, --config=clang --compilation_mode=dbg, bazel_buildables_clang...	18m 1s
build-and-test (TSAN, nokvm, --config=tsan --compilation_mode=dbg, bazel_buildables_sanitizer, ba...	19m 53s
build-and-test (GCC opt, nokvm, --config=gcc --compilation_mode=opt, bazel_buildables_gcc_opt, ba...	31m 26s
build-and-test (ASAN, nokvm, --config=asan --compilation_mode=dbg, bazel_buildables_sanitizer, ba...	25m 24s
build-and-test-status	2s
	2h 23m 11s

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