feat(instance): add warning for deprecated instance types

[Mia-Cross]

We should display a warning when interacting with an instance which type is flagged with EndOfService. That warning will list compatible offers to guide users in their migration process. We can't fetch the exact date of EndOfService for now, but we could add it to the message in a next PR as soon as we're able to get this information.

The message will be displayed as follows:

│ Warning: Your Instance will soon reach End of Service. You can check the exact date on the Scaleway console. We recommend that you migrate your Instance before that.
│ Here are the best options for "ENT1-S", ordered by relevance: [POP2-8C-32G, POP2-2C-8G, POP2-4C-16G, POP2-16C-64G, POP2-32C-128G, POP2-48C-192G, POP2-64C-256G, GP1-XS, GP1-S, GP1-M, GP1-L, GP1-XL, STARDUST1-S, DEV1-S, DEV1-M, DEV1-L, DEV1-XL, PRO2-XXS, PRO2-XS, PRO2-S, PRO2-M, PRO2-L, PLAY2-PICO, PLAY2-NANO, PLAY2-MICRO, POP2-HM-2C-16G, POP2-HM-4C-32G, POP2-HM-8C-64G, POP2-HM-16C-128G, POP2-HM-32C-256G, POP2-HM-48C-384G, POP2-HM-64C-512G, POP2-HC-2C-4G, POP2-HC-4C-8G, POP2-HC-8C-16G, POP2-HC-16C-32G, POP2-HC-32C-64G, POP2-HC-48C-96G, POP2-HC-64C-128G, POP2-HN-3, POP2-HN-5, POP2-HN-10]
│ 
│   with scaleway_instance_server.eos,
│   on endofservice.tf line 14, in resource "scaleway_instance_server" "eos":
│   14:   type = "ENT1-S"
│ 
│ Instance type "ENT1-S" will soon reach End of Service
╵

[remyleone]

Could you put those change in a different PR?