test: fix missing mocker of r,tree for rocky/redat package builds

[blackboxsw]

Found during package builds for recent copr upload.
Inability to pass unittests during package build as non-root user running command:

./tools/run-container --source-package --artifacts=./srpm rockylinux/9

Resulting unittest falilure is due to an ineffective mock.path which should have been mocker.patch.
This doesn't affect Ubuntu because Ubuntu doesn't have directories:

• /var/cache/yum
• /var/cache/dnf

Proposed Commit Message

test: fix missing mocker of rmtree for rocky/redat package builds

Additional Context

Prevents upload to copr test repos

Test Steps

./tools/run-container --source-package --artifacts=./srpm rockylinux/9

Merge type

• Squash merge using "Proposed Commit Message"
• Rebase and merge unique commits. Requires commit messages per-commit each referencing the pull request number (#<PR_NUM>)

[holmanb]

Please fix the commit message. Otherwise this looks good.