[TS/JS] Move TS tests to dedicated folder and deps upgrade (#7508)

* Move TS tests to dedicated folder and deps upgrade

* Attempt to fix generate_code

* Fix dir on CI

* Add js extension

* Fix missing extension

* Harmonize with test gen

* Unexplained code gen change

* Restore yarn.lock

* Naive attempt to fix bazel stuff

* Pin @bazel/typescript to 5.2.0

* Attempt to fix bazel

* More tweak

* Upgrade deps

* Tweak?

* Fix path

* Fix test package

Co-authored-by: Derek Bailey <derekbailey@google.com>

tests/ts/my-game/example/test.ts

@@ -0,0 +1,78 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+
+import * as flatbuffers from 'flatbuffers';
+
+
+
+export class Test {
+  bb: flatbuffers.ByteBuffer|null = null;
+  bb_pos = 0;
+  __init(i:number, bb:flatbuffers.ByteBuffer):Test {
+  this.bb_pos = i;
+  this.bb = bb;
+  return this;
+}
+
+a():number {
+  return this.bb!.readInt16(this.bb_pos);
+}
+
+mutate_a(value:number):boolean {
+  this.bb!.writeInt16(this.bb_pos + 0, value);
+  return true;
+}
+
+b():number {
+  return this.bb!.readInt8(this.bb_pos + 2);
+}
+
+mutate_b(value:number):boolean {
+  this.bb!.writeInt8(this.bb_pos + 2, value);
+  return true;
+}
+
+static getFullyQualifiedName():string {
+  return 'MyGame_Example_Test';
+}
+
+static sizeOf():number {
+  return 4;
+}
+
+static createTest(builder:flatbuffers.Builder, a: number, b: number):flatbuffers.Offset {
+  builder.prep(2, 4);
+  builder.pad(1);
+  builder.writeInt8(b);
+  builder.writeInt16(a);
+  return builder.offset();
+}
+
+
+unpack(): TestT {
+  return new TestT(
+    this.a(),
+    this.b()
+  );
+}
+
+
+unpackTo(_o: TestT): void {
+  _o.a = this.a();
+  _o.b = this.b();
+}
+}
+
+export class TestT {
+constructor(
+  public a: number = 0,
+  public b: number = 0
+){}
+
+
+pack(builder:flatbuffers.Builder): flatbuffers.Offset {
+  return Test.createTest(builder,
+    this.a,
+    this.b
+  );
+}
+}