[ci] Clean up hyperdebug bitstream generation
[ci] Clean up hyperdebug bitstream generation

- Use our custom bazel outquery command to find outputs
- Remove dependency on cw310_sw_build step (Bazel will build all
  necessary deps)
- Remove cw310_sw_build step entirely

Signed-off-by: Miles Dai <0447d2cf64f2d947597a59a7749da4cb3bbe9dd1@google.com>

lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan