codegen error handling bugs #156466

I'm reviewing codegen and seeing some bugs in cleanup on errors, in particular scope enter/exit bugs.
Will use this issue to track them.

Linked PRs

• gh-156466: fix cleanup on error after Enter in codegen_enter_scope #156467
• gh-156466: fix cleanup on error in codegen_setup_annotations_scope #156473
• gh-156466: fix cleanup on error in codegen_leave_annotations_scope #156497
• [3.15] gh-156466: fix cleanup on error in codegen_setup_annotations_scope (#156473) #156498
• [3.14] gh-156466: fix cleanup on error in codegen_setup_annotations_scope (#156473) #156499
• gh-156466: fix cleanup on error in codegen_function_annotations #156502
• gh-156466: fix cleanup on error in codegen_class_body #156507
• [3.15] gh-156466: fix cleanup on error in codegen_function_annotations (GH-156502) #156508
• [3.14] gh-156466: fix cleanup on error in codegen_function_annotations (GH-156502) #156509
• gh-156466: fix cleanup on error in codegen_function_body #156511
• [3.15] gh-156466: fix cleanup on error in codegen_leave_annotations_scope #156520
• [3.14] gh-156466: fix cleanup on error in codegen_leave_annotations_scope  #156522
• [3.15] gh-156466: fix cleanup on error in codegen_class_body (GH-156507) #156535
• [3.14] gh-156466: fix cleanup on error in codegen_class_body (GH-156507) #156536
• gh-156466: Fix additional compiler scope cleanup errors #156547
• [3.15] gh-156466: Fix additional compiler scope cleanup errors (GH-156547) #156571
• [3.14] gh-156466: Fix additional compiler scope cleanup errors (GH-156547) #156572
• [3.15] gh-156466: fix cleanup on error in codegen_function_body (GH-156511) #156578
• [3.14] gh-156466: fix cleanup on error in codegen_function_body (GH-156511) #156579
• [3.13] gh-156466: Fix additional compiler scope cleanup errors (GH-156547) #156582
• [3.13] gh-156466: fix cleanup on error after Enter in codegen_enter_scope #156615
• [3.15] gh-156466: fix cleanup on error after Enter in codegen_enter_scope (GH-156467) #156616
• [3.14]gh-156466: fix cleanup on error after Enter in codegen_enter_scope (#156467) #156617
• gh-156466: ensure in codegen that a pushed COMPILE_FBLOCK_ASYNC_COMPREHENSION_GENERATOR is always popped #157338