fix: handle array-typed org/org_id in AuditEntry JSON unmarshaling

[nghiack7]

Problem

The GitHub Enterprise audit-log API sometimes returns org as a JSON array of strings and org_id as a JSON array of integers, deviating from the documented scalar types. This causes GetAuditLog / GetAuditLog (Enterprise) to return an unmarshal error:

json: cannot unmarshal array into Go struct field entryAlias.org of type string

Reported on v66 and v69. See #3488.

Root cause

AuditEntry.UnmarshalJSON delegates to json.Unmarshal via a type entryAlias AuditEntry alias. When the API returns "org": ["a", "b"] the decoder fails because Org is typed *string.

Fix

In UnmarshalJSON, capture org and org_id as json.RawMessage before the main decode pass, then normalise each:

• string arrays are joined with ", " (preserves all org names)
• int64 arrays use the first element (mirrors how callers would use it)
• Scalar values pass through unchanged

Two unexported helpers (unmarshalStringOrStringArray, unmarshalInt64OrInt64Array) encapsulate the logic so the core unmarshal flow stays readable.

Tests

Added table-driven tests in orgs_audit_log_test.go:

test	payload shape	expected result
org_as_scalar_string	"org":"myorg"	"myorg"
org_as_single_element_array	"org":["myorg"]	"myorg"
org_as_multi_element_array	"org":["org1","org2","org3"]	"org1, org2, org3"
org_id_as_scalar	"org_id":42	42
org_id_as_array	"org_id":[42,43,44]	42 (first element)

All existing audit-log tests continue to pass.

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[codecov]

Codecov Report

❌ Patch coverage is 68.57143% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.67%. Comparing base (9f9ead3) to head (0820df2).

Files with missing lines	Patch %	Lines
github/orgs_audit_log.go	68.57%	5 Missing and 6 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4204      +/-   ##
==========================================
- Coverage   93.71%   93.67%   -0.05%     
==========================================
  Files         209      209              
  Lines       19772    19805      +33     
==========================================
+ Hits        18529    18552      +23     
- Misses       1046     1051       +5     
- Partials      197      202       +5     

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