test(enterprise/coderd): stabilize TestUserSkillAuditDiffTracksContent (#26326)

`GetAuditLogsOffset` orders by `"time" DESC` with no tiebreaker, and
`dbtime.Now` rounds to microseconds, so two audit logs emitted in quick
succession (especially on platforms with coarser clock resolution like
Windows) can land in the same microsecond and Postgres is free to return
them in either order. The test then assumes positional ordering and
breaks.

Sort `rows` by `Action` descending before indexing so `rows[0]` is the
update log and `rows[1]` is the create log regardless of timestamp
collisions.

Closes CODAGT-585
Closes https://github.com/coder/internal/issues/1551

enterprise/coderd/userskills_audit_test.go

@@ -3,6 +3,7 @@ package coderd_test
 import (
 	"encoding/json"
 	"fmt"
+	"sort"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -71,6 +72,7 @@ func TestUserSkillAuditDiffTracksContent(t *testing.T) {
 	)
 	require.NoError(t, err)
 	require.Len(t, rows, 2, "expected exactly two rows")
+	sort.Slice(rows, func(i, j int) bool { return rows[i].AuditLog.Action > rows[j].AuditLog.Action })
 	createLog := rows[1].AuditLog
 	updateLog := rows[0].AuditLog