Browseable public activities should pass accessibility tests #2831
Description
If an activity does not pass all the accessibility checks, then when it is made public:
- there should be a warning saying it won't be browsable until accessibility issues are fixed, and
- it shouldn't actually be browsable.
One unresolved question: should it
- upgrade accessibility warnings to errors and check for errors, or
- check for any accessibility warning?
At least for now, not all accessibility warnings get upgraded to errors. But, it is also a good idea to not let an activity with any errors be browsable.