Fix issue with license not getting obtained & passed to server for legacy maps

[kindsun]

Resolves #62856. The x-pack TileMap plugin exists primarily as a license-check. Users with a license that permits usage of x-pack also get map tiles beyond zoom level 10 for legacy maps (Coordinate, Region and Vega). This license check is initially triggered in the plugin via uiExports > visTypeEnhancers and then executes an update to service_settings through angular.

The issue appears to be with the usage of visTypeEnhancers though it's not immediately clear where that issue lies. I could investigate this further but a couple facts:

• This plugin is the only plugin using visTypeEnhancers. We may want to create a follow-up issue to just remove that code
• This fix is being applied to version 7.7+, but versions 7.8+ will handle licensing differently (without this code) as part of Migrate legacy maps service to NP & update refs #60942

The simplest fix is to use hacks rather than visTypeEnhancers, which works as expected:

Basic license showing calls w/ license injected:

OSS show calls w/o license injected:

It's not entirely clear why one would use hacks vs. visTypeEnhancers but this use case appears to fit the general "hack guidelines" and I don't see the point of leveraging a separate type for this single, simple use case. With that said, I'm definitely open to pushback here.

I also noticed an issue which can also be seen on master where the map appears blank on OSS past zoom level 10. This may have been resolved by #60942 since I didn't see the same behavior there. If not, we may want to create a separate issue for it.

[elasticmachine]

Pinging @elastic/kibana-gis (Team:Geo)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: d195a10

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[thomasneirynck]

thanks for taking this on. tested and verified this works. nice work cleaning up this dangling issue.