Add -d checks to cleanup commands to unblock image builds

[sameluch]

Merge Checklist

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

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

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Summary

What does the PR accomplish, why was it needed?
The changeover to using find instead of rm causes failures when the directories does not exist, unlike previously with rm. Added an if -d around each to resolve the issue

Change Log

• Add "-d" checks for toolkit directories

Does this affect the toolchain?

NO

Test Methodology

• Fasttrack dev pipeline: https://dev.azure.com/mariner-org/mariner/_build/results?buildId=661017&view=results
• delta build: https://dev.azure.com/mariner-org/mariner/_build/results?buildId=661016&view=results

[sameluch]

Closing this PR, Pawel has a very similar PR with better build results here #10800. Change is effectively identical