ci: use preinstalled browser binaries

[RedZapdos123]

Description:

Maintainer requested that the CI fixes be split out from #392 into a separate PR.

This PR keeps only the CI/browser setup changes needed for the static export workflow:

• add a setup-chrome step id in the clippy job so later steps can reliably consume action outputs.
• adjust plotly_static webdriver download error handling so it fits the preinstalled browser/driver flow used in CI.

This keeps PR #397 scoped to CI fixes only.

Checklist:

• I have reviewed all changes in this PR myself.
• This PR does not include the axis-id/API changes from Type trace axis ids #392.
• I have run formatting checks in WSL using cargo +nightly fmt --all -- --check and cd examples && cargo +nightly fmt --all -- --check.
• I have run linting checks in WSL using cargo clippy -p plotly_static --features chromedriver,webdriver_download -- -D warnings -A deprecated and cargo clippy -p plotly_static --features geckodriver,webdriver_download -- -D warnings -A deprecated.
• I have run focused local verification in WSL.

The verification screenshots of the tests run, locally: