refactor: remove support for harbor 2.1.x and older #595

Job	Run time
test-suite (v1.25.16, 1.9.0, uselagoon/build-deploy-image:main, false)	14m 39s
test-suite (v1.25.16, 1.9.0, uselagoon/build-deploy-image:main, false)	14m 39s
test-suite (v1.25.16, 1.14.0, uselagoon/build-deploy-image:main, false)	9m 40s
test-suite (v1.25.16, 1.14.0, uselagoon/build-deploy-image:main, false)	9m 40s
test-suite (v1.26.15, 1.9.0, uselagoon/build-deploy-image:main, false)	8m 54s
test-suite (v1.26.15, 1.9.0, uselagoon/build-deploy-image:main, false)	8m 54s
test-suite (v1.26.15, 1.14.0, uselagoon/build-deploy-image:main, false)	9m 52s
test-suite (v1.26.15, 1.14.0, uselagoon/build-deploy-image:main, false)	9m 52s
test-suite (v1.27.13, 1.14.0, uselagoon/build-deploy-image:main, false)	16m 26s
test-suite (v1.27.13, 1.14.0, uselagoon/build-deploy-image:main, false)	8m 57s
test-suite (v1.28.9, 1.14.0, uselagoon/build-deploy-image:main, false)	9m 50s
test-suite (v1.28.9, 1.14.0, uselagoon/build-deploy-image:main, false)	9m 50s
test-suite (v1.29.4, 1.14.0, uselagoon/build-deploy-image:main, true)	14m 55s
test-suite (v1.29.4, 1.14.0, uselagoon/build-deploy-image:main, true)	14m 55s
test-suite (v1.30.2, 1.14.0, uselagoon/build-deploy-image:main, true)	14m 49s
test-suite (v1.30.2, 1.14.0, uselagoon/build-deploy-image:main, true)	14m 49s
	3h 10m 41s

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