feat: Jwt-auth plugin no longer requires a private_key to be uploaded. #16997

Job	Run time
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[a-k]*)	32m 15s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[l-z]*)	38m 10s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/admin t/cli t/config-center-yaml...	26m 2s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/node t/pubsub t/router t/script ...	27m 33s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[a-k]*)	32m 51s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[l-z]*)	37m 29s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/admin t/cli t/config-center-yaml t/cont...	25m 37s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/node t/pubsub t/router t/script t/secre...	27m 5s
	4h 7m 2s

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