fix(configuration): enabled rules calculation

[Sec-ant]

Summary

It turns out the existing function as_enabled_rules was calculating the enabled rules in a wrong way. The function is generated by codegen, so I fixed the logic in xtask/codegen/src/generate_configuration.rs and regenerated that file. I summarize the correct logic as follows:

For non-nursery groups

• Group-level all and group-level recommend should take precedence over their top-level alternatives.
• When group-level all or group-level recommend is not present, it should fallback to check top-level all or top-level recommend.
• If the whole group-level config is not present, it should check top-level all or top-level recommend.

For nursery group

• Group-level all and group-level recommend should take precedence over top-level alternatives. (same as non-nursery groups)
• When group-level all or group-level recommend is not present, it should fallback to check top-level all or top-level recommend only in unstable releases.
• If the whole group-level config is not present, it should check top-level all or top-level recommend only in unstable releases.

Fixes #2028.

Test Plan

Since the nursery group is unstable because the rules in it may be promoted in later releases, I didn't add test cases for the nursery group. But I tested it locally and it works as expected.

I added a test case called top_level_all_down_level_empty. It's to check whether the non-recommended rules belonging to a group will be enabled if we have a top-level all as true and an empty config of that group. The expected result is they should be kept enabled. In current release (v1.6.1) they are wrongly disabled. I guess the reason why this issue isn't discovered earlier is because most rules under a group are recommended rules.

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[Conaclos]

LGTM. It could be great to add a changelog entry.
You have to add the Unreleased section. See our contributing guide for more details :)