fix: make the message clearer when API key is missing (#11370) #195

Job	Run time
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[a-k]*)	28m 42s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/plugin/[l-z]*)	26m 35s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/admin t/cli t/config-center-yaml...	24m 1s
build (ubuntu-20.04, linux_openresty, lua-resty-worker-events, t/node t/pubsub t/router t/script ...	23m 49s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[a-k]*)	26m 28s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/plugin/[l-z]*)	26m 43s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/admin t/cli t/config-center-yaml t/cont...	24m 12s
build (ubuntu-20.04, linux_openresty, lua-resty-events, t/node t/pubsub t/router t/script t/secre...	26m 20s
	3h 26m 50s

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