Add `TEST_REQUIRES` keyword in `ecbuild_add_test` #46

Job	Run time
ci / setup	1s
ci / ${{ inputs.name_prefix }}formatter	0s
ci / ${{ inputs.name_prefix }}codecov	0s
ci / test-gnu@debian-11	3m 16s
ci / [email protected]	3m 9s
ci / [email protected]	3m 6s
ci / test-gnu@fedora-37	3m 20s
ci / ${{ inputs.name_prefix }}notify	0s
	12m 52s

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