[TS] Fix relative import paths of generated TypeScript code (#8880)

* Refactor logic that generates import paths in AddImport

* Add new tests to validate relative import path fix

* Generate goldens

* Generate example code

* Format TS generator file

* Revert "Format TS generator file"

This reverts commit 0f0b24aee9.

* Fix merge conflicts

---------

Co-authored-by: Björn Harrtell <bjornharrtell@users.noreply.github.com>

tests/ts/tsconfig.json

@@ -1,7 +1,10 @@
 {
   "compilerOptions": {
     "target": "ES2020",
-    "lib": ["ES2020", "DOM"],
+    "lib": [
+      "ES2020",
+      "DOM"
+    ],
     "module": "NodeNext",
     "declaration": true,
     "strict": true
@@ -17,6 +20,7 @@
     "arrays_test_complex/**/*.ts",
     "union_underlying_type_test.ts",
     "long-namespace/**/*.ts",
-    "longer-namespace/**/*.ts"
+    "longer-namespace/**/*.ts",
+    "relative_imports/**/*.ts"
   ]
-}
+}