ci: add test-vanilla-release & test-fork-release CI stages

Summary

• ci: add test-vanilla-release & test-fork-release CI stages + fix tests which were failing
• add ability to do #[tarantool::test(should_panic = cfg!(debug_assertions))]

Ensure that

• New code is covered by tests
• API is documented
• Changelog is up to date
• Version is bumped in the appropriate Cargo.toml files

tarantool/src/lib.rs

@@ -377,6 +377,16 @@ pub use linkme;
 /// }
 /// ```
 ///
+/// You can also have tests which should panic only in certain conditions.
+/// This is done by specifying a constant expression as an argument to the
+/// `should_panic` keyword. Here's an example:
+/// ```no_run
+/// #[tarantool::test(should_panic = cfg!(debug_assertions))]
+/// fn only_panics_in_debug_mode() {
+///     debug_assert!(false);
+/// }
+/// ```
+///
 /// You can also use `#[tarantool::test]` with `async` functions, in which case
 /// the body of the test will be wrapped inside `fiber::block_on(async {})`
 /// block. The following two tests are equivalent: