fix: make mkdocs CLI exception test reach prepare_docs

[immanuwell]

What type of PR is this?

/kind test

What this PR does / why we need it:

Tiny MkDocs CLI test fix. The exception-path test mocked prepare_docs, but then ran main() without a temp --docs-dir, so it bailed on missing site-src before the mock was reached. Oops, test never hit the thing it said it was testing.

Repro on origin/main:

PYTHONPATH=hack python -m unittest discover -s hack/mkdocs/__tests__ -p 'test_cli.py' -k test_main_handles_prepare_docs_exceptions

Before: AssertionError: Exception not raised.
After: the test reaches the mocked prepare_docs and passes. No cloud/API limits or quotas involved here; this is just local CLI arg handling.

Which issue(s) this PR fixes:

None. Related to #3999 and #3860.

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

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This pull-request has been approved by: immanuwell
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