schema: Migrate from scuemata to thema (#49805)

* Remove crufty scuemata bits

Buhbye to: cue/ dir with old definitions, CI steps for checking unnecessary
things, and the original dashboard scuemata file.

* Remove grafana-cli cue subcommand

* Remove old testdata

* Don't swallow errors from codegen

* Small nits and tweaks to cuectx package

* WIP - refactor pluggen to use Thema

Also consolidate the embed.FS in the repo root.

* Finish halfway rename

* Convert all panel models.cue to thema

* Rewrite pluggen to use Thema

* Remove pkg/schema, and trim command

* Remove schemaloader service and usages

Will be replaced by coremodel-centric hydrate/dehydrate system Soon™.

* Remove schemaloader from wire

* Remove hangover field on histogram models.cue

* Fix lint errors, some vestiges of trim service

* Remove unused cuetsify cli command

scripts/drone/pipelines/main.star

@@ -39,8 +39,6 @@ load(
     'upload_packages_step',
     'store_packages_step',
     'upload_cdn_step',
-    'validate_scuemata_step',
-    'ensure_cuetsified_step',
     'verify_gen_cue_step',
     'test_a11y_frontend_step',
     'trigger_oss'
@@ -135,8 +133,6 @@ def get_steps(edition):
         build_frontend_step(edition=edition, ver_mode=ver_mode),
         build_frontend_package_step(edition=edition, ver_mode=ver_mode),
         build_plugins_step(edition=edition, sign=True),
-        validate_scuemata_step(),
-        ensure_cuetsified_step(),
         verify_gen_cue_step(),
     ]
     integration_test_steps = [

scripts/drone/pipelines/pr.star

@@ -29,8 +29,6 @@ load(
     'redis_integration_tests_step',
     'memcached_integration_tests_step',
     'benchmark_ldap_step',
-    'validate_scuemata_step',
-    'ensure_cuetsified_step',
     'verify_gen_cue_step',
     'test_a11y_frontend_step',
     'enterprise_downstream_step',
@@ -125,8 +123,6 @@ def pr_pipelines(edition):
         build_frontend_step(edition=edition, ver_mode=ver_mode),
         build_frontend_package_step(edition=edition, ver_mode=ver_mode),
         build_plugins_step(edition=edition),
-        validate_scuemata_step(),
-        ensure_cuetsified_step(),
         verify_gen_cue_step(),
     ]
     integration_test_steps = [

scripts/drone/pipelines/release.star

@@ -39,8 +39,6 @@ load(
     'upload_packages_step',
     'store_packages_step',
     'upload_cdn_step',
-    'validate_scuemata_step',
-    'ensure_cuetsified_step',
     'verify_gen_cue_step',
     'publish_images_step',
     'trigger_oss'
@@ -182,8 +180,6 @@ def get_steps(edition, ver_mode):
         build_frontend_step(edition=edition, ver_mode=ver_mode),
         build_frontend_package_step(edition=edition, ver_mode=ver_mode),
         build_plugins_step(edition=edition, sign=True),
-        validate_scuemata_step(),
-        ensure_cuetsified_step(),
         verify_gen_cue_step(),
     ]
 
@@ -192,7 +188,6 @@ def get_steps(edition, ver_mode):
         mysql_integration_tests_step(edition=edition, ver_mode=ver_mode),
     ]
 
-
     if include_enterprise2:
         test_steps.extend([
             lint_backend_step(edition=edition2),