Merged tests to produce a single binary (#12826)

This PR should close #7147 

# Description
Merged src/tests into /tests to produce a single binary.

![image](https://github.com/nushell/nushell/assets/94604837/84726469-d447-4619-b6d1-2d1415d0f42e)

# User-Facing Changes
No user facing changes

# Tests + Formatting
Moved tests. Tollkit check pr pass.

# After Submitting

---------

Co-authored-by: Ian Manske <ian.manske@pm.me>

tests/repl/test_iteration.rs

@@ -0,0 +1,41 @@
+use crate::repl::tests::{run_test, TestResult};
+
+#[test]
+fn better_block_types() -> TestResult {
+    run_test(
+        r#"([1, 2, 3] | enumerate | each { |e| $"($e.index) is ($e.item)" }).1"#,
+        "1 is 2",
+    )
+}
+
+#[test]
+fn row_iteration() -> TestResult {
+    run_test(
+        "[[name, size]; [tj, 100], [rl, 200]] | each { |it| $it.size * 8 } | get 1",
+        "1600",
+    )
+}
+
+#[test]
+fn row_condition1() -> TestResult {
+    run_test(
+        "([[name, size]; [a, 1], [b, 2], [c, 3]] | where size < 3).name | get 1",
+        "b",
+    )
+}
+
+#[test]
+fn row_condition2() -> TestResult {
+    run_test(
+        "[[name, size]; [a, 1], [b, 2], [c, 3]] | where $it.size > 2 | length",
+        "1",
+    )
+}
+
+#[test]
+fn par_each() -> TestResult {
+    run_test(
+        r#"1..10 | enumerate | par-each { |it| ([[index, item]; [$it.index, ($it.item > 5)]]).0 } | where index == 4 | get item.0"#,
+        "false",
+    )
+}