[CMS-434] Remove Forms system

.github/workflows/ci.yml

@@ -39,7 +39,13 @@ jobs:
       PGHOST: localhost
       PGPORT: '5432'
       PGUSER: postgres
-      # Rails deprecations print regardless; this adds the Ruby-level ones.
+      # Rails deprecations print regardless (test.rb sets deprecation = :stderr);
+      # this adds the Ruby-level ones.
+      #
+      # It is also the off-switch for test/quiet_warnings.rb, which otherwise filters
+      # gem-origin Ruby warnings out of local runs -- ~650 lines a run, none of it from
+      # our own code. Setting this here keeps CI's record complete. Remove this and CI
+      # loses the Ruby-level warnings twice over.
       RUBYOPT: '-W:deprecated'
       # features/support/open_on_first_failure.rb pops the first failed page
       # open via Capybara's save_and_open_page -> Launchy -> xdg-open. Useful at
@@ -181,8 +187,11 @@ jobs:
     # Phase 3 cleared all five and the job stayed red on ten others. Phase 4
     # stage B cleared those, and the 5.0 bundle has been green since.
     #
-    # As of the end of Phase 4, both bundles run identically:
+    # As of the end of Phase 4, both bundles ran identically:
     # 838 unit / 145 spec / 139 functional / 7 orphan / 154 cucumber, 0F/0E.
+    # CMS-434 then removed the Forms subsystem and its tests. Do not treat the
+    # numbers above as the current expectation -- `script/test-summary` prints
+    # every group's summary in one place if you need today's.
     #
     # KEEP THIS JOB GATING. Three of the four root causes behind those ten
     # failures were NOT Rails 5 incompatibilities. They were live defects on
@@ -199,6 +208,10 @@ jobs:
     # never render, and an attribute chain that answers nil where it should
     # raise. Every one fails identically on 4.2.
     #
+    # (The two Forms defects were closed by CMS-434, which removed the subsystem
+    # rather than repairing it -- unused in production, unreachable from the admin
+    # UI. The argument above is unaffected: they were still found this way.)
+    #
     # So this is not a Rails 5 canary. It is a second execution of the suite
     # under different framework semantics, and it has found more 4.2 bugs than
     # 5.0 ones. That is the argument for keeping it gating now that it passes.

.simplecov

@@ -1,3 +1,9 @@
+# Every test entry point (test/test_helper.rb, spec/minitest_helper.rb,
+# features/support/env.rb) requires simplecov first, which loads this file, so this is
+# the one place shared by all five suites. See test/quiet_warnings.rb for what it does
+# and how to turn it off.
+require_relative 'test/quiet_warnings'
+
 # The suite runs as five separate processes (units, spec, functionals, orphans,
 # features) that merge through coverage/.resultset.json. SimpleCov discards any stored
 # result older than merge_timeout, which defaults to 600s -- so on a full run,

app/assets/javascripts/cms/application.js

@@ -11,7 +11,6 @@
 //= require cms/core_library
 //= require cms/content_types
 //= require cms/attachment_manager
-//= require cms/form_builder
 //= require cms/sitemap
 //= require bootstrap
 //= require bcms/ckeditor