[Upgrade Assistant] Add A11y test for surfaced deprecations

[cuff-links]

Summary

This issue is to add accessibility tests for surfaced deprecations in Upgrade Assistant.

Steps to add

1.) Navigate to Upgrade Assistant
2.) Use ES Archiver to add some data that would surface deprecations on the cluster level and index level.
3.) Navigate to the appropriate tab.
4.) Take the snapshot.

Context:
#90265 (comment)

[elasticmachine]

Pinging @elastic/kibana-accessibility (Project:Accessibility)

[elasticmachine]

Pinging @elastic/es-ui (Team:Elasticsearch UI)

[cjcenizal]

@cuff-links Would you mind checking in with Kibana QA and Kibana Core about whether using ES Archiver is still a best practice? I thought I read somewhere that there was a newer preferred alternative.

[cuff-links]

@cuff-links Would you mind checking in with Kibana QA and Kibana Core about whether using ES Archiver is still a best practice? I thought I read somewhere that there was a newer preferred alternative.

I will reach out and update the issue.

[cuff-links]

@cjcenizal If we are adding test data, we would still use ES Archiver. If we are doing things with the kibana index, then we use the saved objects API. So, in this instance, we would go ahead and use ES Archiver.

[alisonelizabeth]

I'm going to close this issue. The a11y tests should now be testing the UI when there are deprecations. Related work: #109909, #110843.