feat(catalogue): enable access to platform via path /cms

[mswertz]

Demo:

• should be able to navigate to schemas and tables on /cms while having catalogue serve on /

to test:

• NUXT_PUBLIC_SCHEMA=catalogue NUXT_PUBLIC_API_BASE=http://localhost:8080 yarn dev
• or on server go to http://preview-catalogue-pr-5226.dev.molgenis.org/cms/apps/central

Notes:

• had to undo package.json changes for redirect because we need relative paths, will require us to be more strict in URLs and paths (particularly nasty with the menu but it is more precise)
• had to create a proxy config in catalogue for '/cms' (for pointing to schema/apps) and '/apps' (for apps/central/graphql mainly)
• can tell the backend what the proxy path is by passing 'X-Forwarded-Prefix' header when proxying
• on preview helm-chart we need proxy-prefix to be passed otherwise backend doesn't know about the prefix. Note to ops: set in the config map of the ingress, ok?
• need to fix /apps/ui for the new UI as that still has path hardcoded in the config
• need to test if oidc still works

[sonarqubecloud]

Quality Gate failed

Failed conditions
68.2% Coverage on New Code (required ≥ 80%)

See analysis details on SonarQube Cloud

[connoratrug]

The code / idea looks fine, although i do not like the impact of having to use the ../ back everywhere.

for the pr to be merged;

• fix preview setup
• update docs to describe the changes and setup needed
• add tests changes in before handler and non standard header