fix debug_enabled on steps and error handling

[becojo]

In the debug_enabled rule:

• For GitHub Actions, report line numbers of the step or job that enables debugging.
• Fix the step metadata value. It must be the step's index since the id is not always defined.

in analyze_org, log errors instead of cancelling the entire analysis of the org (see #102). Because of the wrong step reported in the debug_enabled rule, an org that had debugging enabled on a single workflow step could not be analyzed at all.

Make it so FindingMeta parsing error are logged instead. Currently, if a finding with metadata that cannot be parse would crash the org's analysis with the following error:

12:55PM | ERROR | error="failed to analyze repo statusburger/actions: json: invalid number literal, trying to unmarshal \"\\\"\\\"\" into Number"

Now it logs the error and the metadata it tried to parse:

12:55PM | ERROR | failed to unmarshal FindingMeta error="json: invalid number literal, trying to unmarshal \"\\\"\\\"\" into Number" meta={"details":"ACTIONS_STEP_DEBUG","job":"build","line":21,"path":".github/workflows/debug.yml","step":""}

[fproulx-boostsecurity]

We should get back to @rgmz (ref #102) as we merge and test this