Dismiss gosec G602 and G115 in test code (#40960)

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**Related issue:** Resolves #
Dismisses some gosec rules in test code where they do not apply, since
they show up when running `golangci-lint run` locally and make it harder
to spot newly introduced errors.

# Checklist for submitter

## Testing

- [x] Added/updated automated tests
- [ ] Where appropriate, [automated tests simulate multiple hosts and
test for host
isolation](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/reference/patterns-backend.md#unit-testing)
(updates to one hosts's records do not affect another)

- [ ] QA'd all new/changed functionality manually

server/worker/automation_failer_test.go

@@ -72,7 +72,7 @@ func TestJiraFailer(t *testing.T) {
 	var failedIndices []int
 	cves := []string{"CVE-2018-1234", "CVE-2019-1234", "CVE-2020-1234", "CVE-2021-1234"}
 	for i := 0; i < 10; i++ {
-		cve := cves[i%len(cves)]
+		cve := cves[i%len(cves)] //nolint:gosec // dismiss G602
 		err := jira.Run(license.NewContext(context.Background(), &fleet.LicenseInfo{Tier: fleet.TierFree}), json.RawMessage(fmt.Sprintf(`{"vulnerability":{"cve":%q}}`, cve)))
 		if err != nil {
 			failedIndices = append(failedIndices, i)
@@ -131,7 +131,7 @@ func TestZendeskFailer(t *testing.T) {
 	var failedIndices []int
 	cves := []string{"CVE-2018-1234", "CVE-2019-1234", "CVE-2020-1234", "CVE-2021-1234"}
 	for i := 0; i < 10; i++ {
-		cve := cves[i%len(cves)]
+		cve := cves[i%len(cves)] //nolint:gosec // dismiss G602
 		err := zendesk.Run(license.NewContext(context.Background(), &fleet.LicenseInfo{Tier: fleet.TierFree}), json.RawMessage(fmt.Sprintf(`{"vulnerability":{"cve":%q}}`, cve)))
 		if err != nil {
 			failedIndices = append(failedIndices, i)