renderer: various fixes towards improving gpu calls robustness (#9188)

ensure framebuffer textures are detached and deleted, avoid leaving framebuffers bound when not needed

* render: avoid calling glDeleteProgram on no program

its safe to do so but it adds a bunch of unnecessery lines in apitrace
when tracing. if guard it and return early.

* opengl: ensure texture and buffers are unbound

ensure bound buffers are unbound after use, also detach textures from
framebuffer before deleting it otherwise it will become dangling and
essentially leak.

src/render/OpenGL.hpp

@@ -233,8 +233,6 @@ class CHyprOpenGLImpl {
 
     SCurrentRenderData                   m_RenderData;
 
-    GLint                                m_iCurrentOutputFb = 0;
-
     Hyprutils::OS::CFileDescriptor       m_iGBMFD;
     gbm_device*                          m_pGbmDevice   = nullptr;
     EGLContext                           m_pEglContext  = nullptr;