Add DigiCert configs. (#26780)

For #26603

This PR includes:
- DigiCert configs
- Some config code for custom SCEP, but not fully functional
- Validation tests for DigiCert Configs
- DigiCert activities (manually tested)

This PR does not include the following:
- Encryption of DigiCert API tokens -- this requires DB migration (in
next PR)
- Making an HTTP call to DigiCert API for validation (in later PR)
- Integration tests (in later PR)
- Changes file (in later PR)

# Checklist for submitter

- [x] Added/updated automated tests
- [x] Manual QA for all new/changed functionality

cmd/fleetctl/testdata/expectedGetConfigAppConfigJson.json

@@ -91,7 +91,9 @@
       "jira": null,
       "zendesk": null,
       "google_calendar": null,
-      "ndes_scep_proxy": null
+      "ndes_scep_proxy": null,
+      "custom_scep_proxy": null,
+      "digicert": null
     },
     "mdm": {
       "android_enabled_and_configured": false,

cmd/fleetctl/testdata/expectedGetConfigAppConfigTeamMaintainerJson.json

@@ -64,7 +64,9 @@
       "jira": null,
       "zendesk": null,
       "google_calendar": null,
-      "ndes_scep_proxy": null
+      "ndes_scep_proxy": null,
+      "custom_scep_proxy": null,
+      "digicert": null
     },
     "mdm": {
       "android_enabled_and_configured": false,

cmd/fleetctl/testdata/expectedGetConfigAppConfigTeamMaintainerYaml.yml

@@ -14,6 +14,8 @@ spec:
     enable_host_users: true
     enable_software_inventory: false
   integrations:
+    custom_scep_proxy: null
+    digicert: null
     google_calendar: null
     jira: null
     ndes_scep_proxy: null

cmd/fleetctl/testdata/expectedGetConfigAppConfigYaml.yml

@@ -14,6 +14,8 @@ spec:
     enable_host_users: true
     enable_software_inventory: false
   integrations:
+    custom_scep_proxy: null
+    digicert: null
     google_calendar: null
     jira: null
     ndes_scep_proxy: null

cmd/fleetctl/testdata/expectedGetConfigIncludeServerConfigJson.json

@@ -146,7 +146,9 @@
       "jira": null,
       "zendesk": null,
       "google_calendar": null,
-      "ndes_scep_proxy": null
+      "ndes_scep_proxy": null,
+      "custom_scep_proxy": null,
+      "digicert": null
     },
     "update_interval": {
       "osquery_detail": "1h0m0s",

cmd/fleetctl/testdata/expectedGetConfigIncludeServerConfigYaml.yml

@@ -14,6 +14,8 @@ spec:
     enable_host_users: true
     enable_software_inventory: false
   integrations:
+    custom_scep_proxy: null
+    digicert: null
     google_calendar: null
     jira: null
     ndes_scep_proxy: null

cmd/fleetctl/testdata/macosSetupExpectedAppConfigEmpty.yml

@@ -14,6 +14,8 @@ spec:
     activity_expiry_enabled: false
     activity_expiry_window: 0
   integrations:
+    custom_scep_proxy: null
+    digicert: null
     google_calendar: null
     jira: null
     ndes_scep_proxy: null

cmd/fleetctl/testdata/macosSetupExpectedAppConfigSet.yml

@@ -14,6 +14,8 @@ spec:
     activity_expiry_enabled: false
     activity_expiry_window: 0
   integrations:
+    custom_scep_proxy: null
+    digicert: null
     google_calendar: null
     jira: null
     ndes_scep_proxy: null