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_regex.rs

@@ -0,0 +1,82 @@
+use crate::repl::tests::{fail_test, run_test, TestResult};
+
+#[test]
+fn contains() -> TestResult {
+    run_test(r#"'foobarbaz' =~ bar"#, "true")
+}
+
+#[test]
+fn contains_case_insensitive() -> TestResult {
+    run_test(r#"'foobarbaz' =~ '(?i)BaR'"#, "true")
+}
+
+#[test]
+fn not_contains() -> TestResult {
+    run_test(r#"'foobarbaz' !~ asdf"#, "true")
+}
+
+#[test]
+fn match_full_line() -> TestResult {
+    run_test(r#"'foobarbaz' =~ '^foobarbaz$'"#, "true")
+}
+
+#[test]
+fn not_match_full_line() -> TestResult {
+    run_test(r#"'foobarbaz' !~ '^foobarbaz$'"#, "false")
+}
+
+#[test]
+fn starts_with() -> TestResult {
+    run_test(r#"'foobarbaz' =~ '^foo'"#, "true")
+}
+
+#[test]
+fn not_starts_with() -> TestResult {
+    run_test(r#"'foobarbaz' !~ '^foo'"#, "false")
+}
+
+#[test]
+fn ends_with() -> TestResult {
+    run_test(r#"'foobarbaz' =~ 'baz$'"#, "true")
+}
+
+#[test]
+fn not_ends_with() -> TestResult {
+    run_test(r#"'foobarbaz' !~ 'baz$'"#, "false")
+}
+
+#[test]
+fn where_works() -> TestResult {
+    run_test(
+        r#"[{name: somefile.txt} {name: anotherfile.csv }] | where name =~ ^s | get name.0"#,
+        "somefile.txt",
+    )
+}
+
+#[test]
+fn where_not_works() -> TestResult {
+    run_test(
+        r#"[{name: somefile.txt} {name: anotherfile.csv }] | where name !~ ^s | get name.0"#,
+        "anotherfile.csv",
+    )
+}
+
+#[test]
+fn invalid_regex_fails() -> TestResult {
+    fail_test(r#"'foo' =~ '['"#, "Invalid character class")
+}
+
+#[test]
+fn invalid_not_regex_fails() -> TestResult {
+    fail_test(r#"'foo' !~ '['"#, "Invalid character class")
+}
+
+#[test]
+fn regex_on_int_fails() -> TestResult {
+    fail_test(r#"33 =~ foo"#, "is not supported")
+}
+
+#[test]
+fn not_regex_on_int_fails() -> TestResult {
+    fail_test(r#"33 !~ foo"#, "is not supported")
+}