Fix test failures from removed image references (#44932)

Tests were failing because `wgetImage` and other deprecated images were
removed from `values.yaml` but their references remained in templates
and schemas.

**Changes:**
- Replace `wgetImage` → `ubuntuImage` in clickhouse/solr wait containers
(`_dbWait.tpl`)
- Remove orphaned schema files: `wgetImage`, `alpineImage`,
`scratchImage`, `yqImage`, `openvpnImage`, `wireguardImage`,
`redisClientImage`
- Clean schema references in `values.schema.json`

**Before:**
```yaml
{{- define "tc.v1.common.lib.deps.wait.clickhouse" -}}
imageSelector: wgetImage  # Image no longer exists
```

**After:**
```yaml
{{- define "tc.v1.common.lib.deps.wait.clickhouse" -}}
imageSelector: ubuntuImage  # Uses existing ubuntu image with wget
```

All 1346 unit tests now pass.

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Author: Copilot

charts/library/common/schemas/images/alpineImage.json

@@ -236,7 +236,7 @@ command:
 {{- define "tc.v1.common.lib.deps.wait.clickhouse" -}}
 enabled: true
 type: system
-imageSelector: wgetImage
+imageSelector: ubuntuImage
 securityContext:
   runAsUser: 568
   runAsGroup: 568
@@ -280,7 +280,7 @@ args:
 {{- define "tc.v1.common.lib.deps.wait.solr" -}}
 enabled: true
 type: system
-imageSelector: wgetImage
+imageSelector: ubuntuImage
 securityContext:
   runAsUser: 568
   runAsGroup: 568

charts/library/common/schemas/images/openvpnImage.json

@@ -144,30 +144,14 @@
       "$ref": "file:///home/runner/work/truecharts/truecharts/charts/library/common/schemas/images/codeserverImage.json",
       "description": "Configuration for `codeserverImage`."
     },
-    "alpineImage": {
-      "$ref": "file:///home/runner/work/truecharts/truecharts/charts/library/common/schemas/images/alpineImage.json",
-      "description": "Configuration for `alpineImage`."
-    },
     "ubuntuImage": {
       "$ref": "file:///home/runner/work/truecharts/truecharts/charts/library/common/schemas/images/ubuntuImage.json",
       "description": "Configuration for `ubuntuImage`."
     },
-    "scratchImage": {
-      "$ref": "file:///home/runner/work/truecharts/truecharts/charts/library/common/schemas/images/scratchImage.json",
-      "description": "Configuration for `scratchImage`."
-    },
     "kubectlImage": {
       "$ref": "file:///home/runner/work/truecharts/truecharts/charts/library/common/schemas/images/kubectlImage.json",
       "description": "Configuration for `kubectlImage`."
     },
-    "wgetImage": {
-      "$ref": "file:///home/runner/work/truecharts/truecharts/charts/library/common/schemas/images/wgetImage.json",
-      "description": "Configuration for `wgetImage`."
-    },
-    "yqImage": {
-      "$ref": "file:///home/runner/work/truecharts/truecharts/charts/library/common/schemas/images/yqImage.json",
-      "description": "Configuration for `yqImage`."
-    },
     "postgresClientImage": {
       "$ref": "file:///home/runner/work/truecharts/truecharts/charts/library/common/schemas/images/postgresClientImage.json",
       "description": "Configuration for `postgresClientImage`."
@@ -176,10 +160,6 @@
       "$ref": "file:///home/runner/work/truecharts/truecharts/charts/library/common/schemas/images/mariadbClientImage.json",
       "description": "Configuration for `mariadbClientImage`."
     },
-    "redisClientImage": {
-      "$ref": "file:///home/runner/work/truecharts/truecharts/charts/library/common/schemas/images/redisClientImage.json",
-      "description": "Configuration for `redisClientImage`."
-    },
     "valkeyClientImage": {
       "$ref": "file:///home/runner/work/truecharts/truecharts/charts/library/common/schemas/images/valkeyClientImage.json",
       "description": "Configuration for `valkeyClientImage`."
@@ -220,14 +200,6 @@
       "$ref": "file:///home/runner/work/truecharts/truecharts/charts/library/common/schemas/images/postgresVectorchord16Image.json",
       "description": "Configuration for `postgresVectorchord16Image`."
     },
-    "openvpnImage": {
-      "$ref": "file:///home/runner/work/truecharts/truecharts/charts/library/common/schemas/images/openvpnImage.json",
-      "description": "Configuration for `openvpnImage`."
-    },
-    "wireguardImage": {
-      "$ref": "file:///home/runner/work/truecharts/truecharts/charts/library/common/schemas/images/wireguardImage.json",
-      "description": "Configuration for `wireguardImage`."
-    },
     "ingress": {
       "$ref": "file:///home/runner/work/truecharts/truecharts/charts/library/common/schemas/ingress.json",
       "description": "Create Ingress objects"