Unfortunately even if you're at "the end of your career" or you don't want to manage people... training the buggers, and helping them grow, seems par for the course in every role where people are. There's a concept called "leaderfulness" (awful word but nice idea) where you lean into your ability to help others grow, wherever you are in the system. You don't have to be their line manager, sometimes they are even your boss.
If you want them to change their behaviours, because it would make your life easier, you will have to think about the new behaviour you want them to do, and create a situation where they are incentivised to do the new thing not the old thing.
Direct report - needs actual managing from you. Weekly check in, say you copied me on x y and z why was that? Next time please don't, and set a shared goal for what the person will do instead. Next weekly catch up, what are the sanctions if they do it again, or what is the training need if they are too worried to do it themselves or lack the skill or confidence? This is actually part of your job.
Boss - trickiest as maybe checking the portals does fall better to you than her as she is probably busy with things that are in her role to do and this is easy to pass on. Is doing it making you late finishing other tasks? Then do the old classic "what do you want me to reprioritise?" or "How quickly is this needed as I am doing x?" If you are too busy, is there someone more junior who you could bring into the task each time you are asked and get them to do it, gradually moving it to their responsibility? "Menial" is a shit word by the way, lots of things simply need to get done and it's not beneath anyone to do them, it is sometimes cost effective for the right person to do them. Boss sounds quite reasonable to be doing this, to me - and really if it's quick you could just suck it up for a quiet life.
Colleague: retrain him not to rely on you by saying you haven't finished yet - or saying "If you're concerned about it then I'd be happy to cast an eye over your version". Just create a different path where he subtly doesn't get your copy before sharing his.
This is a big response to quite a brief OP but I feel like actually you're working yourself up into being quite a toxic resentful person in your office. Come on, you know how to task manage this shit without taking it personally, you've probably been doing it for years, if you're at the latter part of your career. And if you haven't, well it is never too late to learn new perspectives and helpful life skills.