Inspect saved object doesn't respect base path

[Dosant]

Kibana version: 7.10, master (works in 7.9.2)
Original install method (e.g. download page, yum, from source, etc.): Cloud + local master

Describe the bug:

Inspect option in SO context menu doesn't respect Kibana's base path when navigating.
I checked at least visualize SO and dashboard SO, but I think it is a global issue.

Steps to reproduce:

1. Create a space and create an SO
2. go to managements -> Saved Objects -> pick a saved object -> Inspect
3. Navigate outside of space

Expected behavior:

Base path is taken into account

Screenshots (if relevant):

I am in non-default space:

Navigating to SO get redirect to default space and SO doesn't exist in default space:

Any additional context:

• Checked that it works in 7.9.2
• In case of local development with dynamic base path you get 404 on inspect

[elasticmachine]

Pinging @elastic/kibana-platform (Team:Platform)

[pgayvallet]

Got a different, but still broken, behavior on my local instance. When clicking inspect, I get that:

Root caused is still the lack of basePath in the url/action though.

[pgayvallet]

Seems like that was actually introduced by #66781 : https://github.com/elastic/kibana/pull/66781/files#diff-9c8e3a0080e7f9c4933b22ef59b7b2285b20791870b6ba1548229843538833f6 is not appending the basePath.

The bug is not present on 7.9 because #78565 that was fixing navigating to a path without specifying the basePath only got merged in 7.10