Reduce OSGuard OS disk size to 30 GB to align with AKS minimum requirement

[miz060]

Merge Checklist

All boxes should be checked before merging the PR (just tick any boxes which don't apply to this PR)

• [x] The toolchain has been rebuilt successfully (or no changes were made to it)
• [x] The toolchain/worker package manifests are up-to-date
• [x] Any updated packages successfully build (or no packages were changed)
• [x] Packages depending on static components modified in this PR (Golang, *-static subpackages, etc.) have had their Release tag incremented.
• [x] Package tests (%check section) have been verified with RUN_CHECK=y for existing SPEC files, or added to new SPEC files
• [x] All package sources are available
• [x] cgmanifest files are up-to-date and sorted (./cgmanifest.json, ./toolkit/scripts/toolchain/cgmanifest.json, .github/workflows/cgmanifest.json)
• [x] LICENSE-MAP files are up-to-date (./LICENSES-AND-NOTICES/SPECS/data/licenses.json, ./LICENSES-AND-NOTICES/SPECS/LICENSES-MAP.md, ./LICENSES-AND-NOTICES/SPECS/LICENSE-EXCEPTIONS.PHOTON)
• [x] All source files have up-to-date hashes in the *.signatures.json files
• [x] sudo make go-tidy-all and sudo make go-test-coverage pass
• [x] Documentation has been updated to match any changes to the build system
• [x] Ready to merge

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Summary

Reduce OSGuard OS disk size to 30 GB to match AKS requirements. Reference: https://learn.microsoft.com/en-us/azure/aks/use-multiple-node-pools. It mentions "You can also reduce the default size of the OS disk using --node-osdisk-size, but keep in mind the minimum size for AKS images is 30 GB." Without this change, some AKS E2E test scenarios would require increasing the default OS disk size beyond 40 GB. We’d also need to document this requirement for OSGuard.

Change Log

• Reduce OSGuard OS disk size to 30 GB

Does this affect the toolchain?

NO

Test Methodology