Fix raw action config endpoint shadowed by config router

Rename GET/PUT /api/config/actions/{name} to /actions/{name}/raw in
file_config.py to eliminate the route-shadowing conflict with config.py,
which registers its own GET /actions/{name} returning ActionConfig.

Add configActionRaw endpoint helper in endpoints.ts and update
fetchActionFile/updateActionFile in config.ts to use it. Add
TestGetActionFileRaw and TestUpdateActionFileRaw test classes.

frontend/src/api/endpoints.ts

@@ -104,6 +104,7 @@ export const ENDPOINTS = {
     `/config/jails/${encodeURIComponent(jailName)}/action/${encodeURIComponent(actionName)}`,
   configActions: "/config/actions",
   configAction: (name: string): string => `/config/actions/${encodeURIComponent(name)}`,
+  configActionRaw: (name: string): string => `/config/actions/${encodeURIComponent(name)}/raw`,
   configActionParsed: (name: string): string =>
     `/config/actions/${encodeURIComponent(name)}/parsed`,