feat(entityemptystate): added appreance prop support [KHCP-14905]

[afrzhussain]

Summary
JIRA : https://konghq.atlassian.net/browse/KHCP-14905

• Added appearance prop with 'primary' and 'secondary' options to support L2 empty states. The secondary appearance has a slightly smaller title font size.
• Fixed feature cards taking up unnecessary space when features are empty.

[CLAassistant]

All committers have signed the CLA.

[kaiarrowood]

LGTM! 🚀

Issues addressed

[kaiarrowood]

LGTM! 🚀

[kongponents-bot]

Preview components from this PR in consuming application

In consuming application project install preview versions of shared packages generated by this PR:

@kong-ui-public/entities-shared@pr-1919
@kong-ui-public/dashboard-renderer@pr-1919
@kong-ui-public/documentation@pr-1919
@kong-ui-public/tracing@pr-1919
@kong-ui-public/entities-certificates@pr-1919
@kong-ui-public/entities-consumer-credentials@pr-1919
@kong-ui-public/entities-consumer-groups@pr-1919
@kong-ui-public/entities-consumers@pr-1919
@kong-ui-public/entities-data-plane-nodes@pr-1919
@kong-ui-public/entities-gateway-services@pr-1919
@kong-ui-public/entities-key-sets@pr-1919
@kong-ui-public/entities-keys@pr-1919
@kong-ui-public/entities-routes@pr-1919
@kong-ui-public/entities-snis@pr-1919
@kong-ui-public/entities-upstreams-targets@pr-1919
@kong-ui-public/entities-vaults@pr-1919
@kong-ui-public/entities-plugins@pr-1919