feat: add optional Galaxy server auth inputs to sanity, unit, and integration workflows #514

Job	Run time
lint	10s
self-ansible-lint / Ansible Lint	16s
self-integration / Matrix Integration	19s
self-build-import / build-import-collection	23s
self-sanity / Matrix Sanity	20s
self-unit / Matrix Unit	17s
self-unit / unit-py3.14-2.20	1m 25s
self-unit / unit-py3.13-2.18	55s
self-unit / unit-py3.13-2.20	57s
self-unit / unit-py3.13-2.19	53s
self-sanity / sanity-py3.13-2.19	48s
self-sanity / sanity-py3.13-2.18	51s
self-sanity / sanity-py3.13-2.20	51s
self-sanity / sanity-py3.14-2.20	50s
self-integration / integration-py3.13-2.20	49s
self-integration / integration-py3.13-2.18	49s
self-integration / integration-py3.13-2.19	59s
self-integration / integration-py3.14-2.20	4m 0s
check	5s
	15m 57s

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