fix(js/ai): fixed dynamic tools/resources becoming non-dynamic once registered

[pavelgj]

test case in question

  it('should remain dynamic after registration', () => {
    const dynamic = tool({ name: 'dynamic', description: 'test' });
    assert.strictEqual(isDynamicTool(dynamic), true);

    registry.registerAction('tool', dynamic);

    assert.strictEqual(isDynamicTool(dynamic), true);
  });

and

  it('should remain dynamic after registration', () => {
    const dynamic = resource({ uri: 'bar://baz' }, () => ({
      content: [{ text: `bar` }],
    }));
    assert.strictEqual(isDynamicResourceAction(dynamic), true);

    registry.registerAction('resource', dynamic);

    assert.strictEqual(isDynamicResourceAction(dynamic), true);
  });

Checklist (if applicable):

• PR title is following https://www.conventionalcommits.org/en/v1.0.0/
• Tested (manually, unit tested, etc.)
• Docs updated (updated docs or a docs bug required)