Migrate admin apps node to admin vlan

List of (tool, node, service) impacted:

|-------+----------+-------------------+---------------+---------------------------------|
| task  | tool     | node              | reverse proxy | note                            |
|-------+----------+-------------------+---------------+---------------------------------|
| #3873 | netbox   | inventory.i.s.o   | no            | internal use                    |
| #3891 | sentry   | riverside.i.s.o   | yes           | current reverse proxy: pergamon |
| #3897 | keycloak | kelvingrove.i.s.o | yes           | current reverse proxy: tate     |
| #3898 | getty    | getty.i.s.o       | yes           | internal use                    |
|-------+----------+-------------------+---------------+---------------------------------|

Reverse proxy to use: rp1.internal.admin.swh.network

Related to #3817 (closed)

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Migrated from T3850 (view on Phabricator)