Do not exclude files during parsing if using --suite option

[pekkaklarck]

Currently when the --suite option is used, files not matching the specified suite aren't parsed at all. This is a useful performance optimization, but it doesn't work well with the new Name setting (#4583) that allows configuring the suite name in the parsed file itself. In addition to that, suites not being parsed and not thus not being available for pre-run modifiers can cause surprises. To avoid all these issues, it is better to not use --suite for limiting what files are parsed at all.

This change isn't functionally backwards incompatible, but it obviously affects those who --suite to make parsing faster. A precondition to such a change is having an explicit way to limit what files are parsed (#4687).

[pekkaklarck]

Several things have changed after I submitted this issue:

• Support for limiting (Add explicit command line option to limit which files are parsed #4687) will be included in RF 6.1 thanks to get PR Add explicit command line option to limit which files are parsed #4735.
• We got issue [Bug] Suite with new "Name" setting cannot be selected by "--suite" option #4758 explaining problems caused by --suite not working with the new Name setting.
• External parser API has been added (External parser API for custom parsers #1283). External parsers may create suites with whatever names and --suite should work with them.

Due to the above changes, I believe it is best to make this change already in RF 6.1. It would be stupid to make a release where --suite doesn't work reliably, and those who depend on its current performance enhancement will have an alternative available.