Rework how data is inserted

This is the big change needed to allow for parallel revision
processing. Previously, a lock was used to prevent this since the parallel
transactions could deadlock if each inserted data that the other then went to
insert.

By defining the order in which inserts happen, both in terms of the order of
tables, and the order of rows within the table, this change should guarantee
that there won't be deadlocks.

I'm also hoping this change will address whatever issue was causing some
derivation data to be missing from the database.

Makefile.am

@@ -98,8 +98,6 @@ SOURCES =									\
   guix-data-service/model/git-repository.scm					\
   guix-data-service/model/guix-revision-package-derivation.scm			\
   guix-data-service/model/guix-revision.scm					\
-  guix-data-service/model/license-set.scm					\
-  guix-data-service/model/license.scm						\
   guix-data-service/model/lint-checker.scm					\
   guix-data-service/model/lint-warning-message.scm				\
   guix-data-service/model/lint-warning.scm					\
@@ -148,16 +146,9 @@ TESTS =					\
   tests/branch-updated-emails.scm		\
   tests/forgejo.scm				\
   tests/jobs-load-new-guix-revision.scm	\
-  tests/model-derivation.scm			\
   tests/model-git-branch.scm			\
   tests/model-git-commit.scm			\
-  tests/model-git-repository.scm		\
-  tests/model-license-set.scm			\
-  tests/model-license.scm			\
-  tests/model-lint-checker.scm			\
-  tests/model-lint-warning-message.scm		\
-  tests/model-package.scm			\
-  tests/model-package-metadata.scm
+  tests/model-git-repository.scm
 
 AM_TESTS_ENVIRONMENT = abs_top_srcdir="$(abs_top_srcdir)"