Allow to change RHS table in each join (#40891)

frontend/src/metabase-lib/join.ts

..._builder/components/notebook/steps/JoinStep/Join/Join.tsx

...ebook/steps/JoinStep/JoinComplete/JoinComplete.styled.tsx

...nts/notebook/steps/JoinStep/JoinComplete/JoinComplete.tsx

.../components/notebook/steps/JoinStep/JoinComplete/index.ts

...omponents/notebook/steps/JoinStep/JoinDraft/JoinDraft.tsx

...y_builder/components/notebook/steps/JoinStep/JoinStep.tsx

...components/notebook/steps/JoinStep/JoinStep.unit.spec.tsx

...steps/JoinStep/JoinTablePicker/JoinTablePicker.styled.tsx

...tebook/steps/JoinStep/JoinTablePicker/JoinTablePicker.tsx