Bug(hardware): platform on misc data is not yet supported

Most riscv tests are sending the platform data in the "misc" field but we were expecting the platform data in the "environment_misc" field, so in a lot of places that hardware won't be shown.

In the tree details and test details page the hardware is listed as "Unknown" (because the environment_misc field is empty) and also in the hardware details and hardware listing that platform won't be shown since they are relying on the platform being only in the environment_misc field as well, not in the misc field.

Example: [riscv test](https://dashboard.kernelci.org/test/riscv%3Acdc93e7894ecfa62c3be850bd17c2fb4c4325364ac0496a3f642b2b6a2ec2618) with qemu-riscv64 platform in the misc field, but the "hardware" in the page is shown as Unknown.

Trace how platform data is read from the misc and environment_misc fields in the tree details, test details, hardware details, and hardware listing pages. Verify the riscv example and consider the work complete when qemu-riscv64 is displayed as hardware wherever platform data is provided in misc.

Written by the indexing model from the issue text.