[chore] Add .gitattributes #15353

Job	Run time
govulncheck	25s
setup-environment	15s
checks	3m 6s
lint	2m 48s
cross-build-collector (darwin, amd64)	36s
unittest-matrix (~1.21.3)	2m 57s
cross-build-collector (darwin, arm64)	1m 9s
test-coverage	2m 48s
unittest-matrix (~1.20.10)	3m 10s
cross-build-collector (linux, 386)	42s
cross-build-collector (linux, amd64)	44s
cross-build-collector (linux, arm64)	50s
cross-build-collector (linux, ppc64le)	1m 23s
cross-build-collector (linux, arm, 7)	1m 19s
cross-build-collector (linux, s390x)	51s
cross-build-collector (windows, 386)	54s
cross-build-collector (windows, amd64)	41s
unittest	2s
	24m 40s

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