`get_files` in the CLI needs to support regression reports

[tevoinea]

Information

• Onefuzz version: 8.5.0
• OS: N/A

Provide detailed reproduction steps (if any)

1. Execute onefuzz repro get_files on a regression report

*snip*
ERROR:cli:traceback: Traceback (most recent call last):
ERROR:cli:traceback:   File "onefuzz\cli.py", line 602, in execute_api
ERROR:cli:traceback:   File "onefuzz\cli.py", line 77, in call_func
ERROR:cli:traceback:   File "onefuzz\api.py", line 562, in get_files
ERROR:cli:traceback: KeyError: 'input_blob'
ERROR:cli:traceback:
ERROR:cli:command failed: input_blob

AB#162907

[kananb]

#3340