Feature/remove sys reqs wildcard

[Minimonium]

Changelog: Feature: Allow using wildcards to remove system requirements sentinel from cache.
Docs: conan-io/docs#1294

Fixes #4478

It handles the ref case to keep the old behaviour but changes the error message when no pattern or reference has been passed (to highlight that wildcards allowed too now).

I've removed this line:

ref = self._check_query_parameter_and_get_reference(args.pattern_or_reference, args.query)

Since the reference is not needed at this scope anymore, I'm not sure that the query check is still needed since it's the only case of using this function in the program. Consider removing the static function too.

[Minimonium]

So, I have left the remove_system_reqs function in the cache to handle errors as close as possible to the call, I have pulled up the branching to the command and handling to the conan_api.

[jgsogo]

Good! Just a change you couldn't be aware of. Thanks for your contribution!

[danimtb]

thanks for the contribution! Please check the suggestion above 😄

[danimtb]

@Minimonium please solve the conflicts in the files above and it would be ready for merge. Thanks!

[jgsogo]

Waiting for those conflicts to be solved. Thanks!

[danimtb]

I have just realized that the documentation update is missing in this PR. An example at the bottom of this page: https://docs.conan.io/en/latest/reference/commands/misc/remove.html

[Minimonium]

Docs: conan-io/docs#1294