[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/union_vector/hand-fan.js

@@ -0,0 +1,64 @@
+// automatically generated by the FlatBuffers compiler, do not modify
+import * as flatbuffers from 'flatbuffers';
+export class HandFan {
+    constructor() {
+        this.bb = null;
+        this.bb_pos = 0;
+    }
+    __init(i, bb) {
+        this.bb_pos = i;
+        this.bb = bb;
+        return this;
+    }
+    static getRootAsHandFan(bb, obj) {
+        return (obj || new HandFan()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+    }
+    static getSizePrefixedRootAsHandFan(bb, obj) {
+        bb.setPosition(bb.position() + flatbuffers.SIZE_PREFIX_LENGTH);
+        return (obj || new HandFan()).__init(bb.readInt32(bb.position()) + bb.position(), bb);
+    }
+    length() {
+        const offset = this.bb.__offset(this.bb_pos, 4);
+        return offset ? this.bb.readInt32(this.bb_pos + offset) : 0;
+    }
+    mutate_length(value) {
+        const offset = this.bb.__offset(this.bb_pos, 4);
+        if (offset === 0) {
+            return false;
+        }
+        this.bb.writeInt32(this.bb_pos + offset, value);
+        return true;
+    }
+    static getFullyQualifiedName() {
+        return 'HandFan';
+    }
+    static startHandFan(builder) {
+        builder.startObject(1);
+    }
+    static addLength(builder, length) {
+        builder.addFieldInt32(0, length, 0);
+    }
+    static endHandFan(builder) {
+        const offset = builder.endObject();
+        return offset;
+    }
+    static createHandFan(builder, length) {
+        HandFan.startHandFan(builder);
+        HandFan.addLength(builder, length);
+        return HandFan.endHandFan(builder);
+    }
+    unpack() {
+        return new HandFanT(this.length());
+    }
+    unpackTo(_o) {
+        _o.length = this.length();
+    }
+}
+export class HandFanT {
+    constructor(length = 0) {
+        this.length = length;
+    }
+    pack(builder) {
+        return HandFan.createHandFan(builder, this.length);
+    }
+}