chore: Cleanup Type 4.0 deployment path

[Bownairo]

4.0 is and was not used anywhere.

Type 4.0 originally was used to experiment with overcommitting vCPUs, and this later swapped with and replaced type 4.1.

[zeropath-ai]

✅ No security or compliance issues detected. Reviewed everything up to 02f2ccd.

Security Overview

• 🔎 Scanned files: 3 changed file(s)
• 🔗 Scan Link: https://zeropath.com/app/repositories/6992424c-495e-4621-b441-efd6821a4be6?scanId=c5dcbd6e-b3e9-4753-add9-4b37b5506723&codeScanTypes=PrScan&tab=issues

Detected Code Changes

Change Type	Relevant files
Bug Fix	► ic-os/components/hostos/guestos/start-guestos.sh     Remove a conditional case for type4.0 in node_reward_type handling
Bug Fix	► ic-os/components/setupos/install-hostos.sh     Remove a case entry for type4.0 in resize_partition function
Bug Fix	► rs/ic_os/os_tools/guest_vm_runner/src/guest_vm_config.rs     Remove type4.0 handling in resource split for type 4 and adjust topology condition

[blind-oracle]

4.0 isn't/wasn't used anywhere?

[Bownairo]

4.0 isn't/wasn't used anywhere?

I just added a little blurb to the description. Maybe @r-birkner can confirm for sure that nobody is using this?

[r-birkner]

Yes, type4.0 was never used. We only use type4 and then type4.1 to type4.5