Jobsets: update schema to align with the API

To further align with the API, we return custom JSON in order to display a
`visible` field rather than `hidden` -- a `PUT` request expects `visible`, while
a `GET` request returns `hidden`.

This also allows us to rename the `jobsetinputs` field to `inputs` for the same
reason: `PUT` expects `inputs`, while `GET` returns `jobsetinputs`.

t/Controller/Jobset/http.t

@@ -46,7 +46,7 @@ subtest 'Create new jobset "job" as flake type' => sub {
       Cookie => $cookie,
       Content => encode_json({
         enabled => 2,
-        visible => 1,
+        visible => JSON::true,
         name => "job",
         type => 1,
         description => "test jobset",
@@ -76,8 +76,8 @@ subtest 'Read newly-created jobset "job"' => sub {
      errormsg => "",
      fetcherrormsg => "",
      flake => "github:nixos/nix",
-     hidden => JSON::false,
-     jobsetinputs => {},
+     visible => JSON::true,
+     inputs => {},
      keepnr => 3,
      lastcheckedtime => undef,
      name => "job",
@@ -99,12 +99,12 @@ subtest 'Update jobset "job" to legacy type' => sub {
       Cookie => $cookie,
       Content => encode_json({
         enabled => 3,
-        visible => 1,
+        visible => JSON::true,
         name => "job",
         type => 0,
         nixexprinput => "ofborg",
         nixexprpath => "release.nix",
-        jobsetinputs => {
+        inputs => {
           ofborg => {
             name => "ofborg",
             type => "git",
@@ -134,15 +134,13 @@ subtest 'Update jobset "job" to legacy type' => sub {
     errormsg => "",
     fetcherrormsg => "",
     flake => "",
-    hidden => JSON::false,
-    jobsetinputs => {
+    visible => JSON::true,
+    inputs => {
       ofborg => {
         name => "ofborg",
         type => "git",
         emailresponsible => JSON::false,
-        jobsetinputalts => [
-          "https://github.com/NixOS/ofborg.git released"
-        ]
+        value => "https://github.com/NixOS/ofborg.git released"
       }
     },
     keepnr => 1,