Add `TEST_REQUIRES` keyword in `ecbuild_add_test` #47

Job	Run time
ci / setup	2s
ci / ${{ inputs.name_prefix }}formatter	0s
ci / test-gnu@debian-11	1m 4s
ci / ${{ inputs.name_prefix }}codecov	0s
ci / [email protected]	3m 0s
ci / [email protected]	52s
ci / test-gnu@fedora-37	1m 5s
ci / ${{ inputs.name_prefix }}notify	0s
	6m 3s

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