[ObsUx] Remove feature flags enabled by default

[jennypavlova]

Summary

We have some feature flags that are enabled by default. Those settings can be removed and marked as deprecated.

The list of the configs I found (we need to double check and decide if we want to remove all/some of them):

• observability:apmTraceExplorerTab (Tech Preview: enabled by default)
• observability:apmEnableTableSearchBar (Beta: enabled by default)
• observability:apmEnableServiceInventoryTableSearchBar (Tech Preview: enabled by default)
• observability:apmTraceExplorerTab (Tech Preview: enabled by default)

No longer beta/tech preview

• observability:enableInfrastructureHostsView (No longer beta: enabled by default)

• observability:enableInfrastructureContainerAssetView (No longer beta: enabled by default)

Questions/Notes

• Any documentation update needed: should we add follow-up issues
• What is the right approach to mark them as deprecated (or should we remove them completely)?
• Good way to test the version update

AC

• Make sure the feature flags are no longer used in the codebase
• Update any usage in the code (tests as well)
• Make sure that if the flags are set in an older version there are no errors after an update to v9

[elasticmachine]

Pinging @elastic/obs-ux-infra_services-team (Team:obs-ux-infra_services)

[smith]

We might want to make decisions on a case-by-case basis which items to remove here. For the items that are no longer beta we should remove the setting. We should decide which items we want to promote from beta to GA or tech preview to beta or GA, etc.

[jennypavlova]

@smith Thanks for checking that!

For the items that are no longer beta we should remove the setting.

Agree, I added a subtask for that and I will remove them 👍

We should decide which items we want to promote from beta to GA or tech preview to beta or GA, etc.

I will keep the list in this issue in case we want to check those and decide (maybe here or as a follow-up in the future)

[jennypavlova]

Closing this for now as the other feature flags won't be removed here