Move bundle selection types and EreportFilters to nexus-types

[mergeconflict]

Move:

• BundleDataSelection (from omicron_nexus::app::background::tasks::support_bundle::request), along with its constituent bits: BundleDataCategory, BundleData, SledSelection, into nexus_types::support_bundle
• EreportFilters (from nexus_db_queries::db::datastore::ereport), used by BundleData::Ereports, into nexus_types::fm::ereport.

... so they can be shared between the support bundle collector (which currently uses them) and fault management's various Case types (in PR #10090).

This is a pure refactor, no behavior changes here.

[hawkw]

Part of me wants to make the fields private and do the validation in a constructor, so all instances of the type are validated...but, looking back, I think the reason I didn't do it that way originally is that I wanted the start and end timestamps to be provided as named fields, rather than as unnamed function parameters, so it was obvious to the reader which is which. Given that, I don't really think it's worth messing with.

If you really wanted to do it the Right Way, you could have the constructor take one of the std range types as a single argument, so you could call it with start...end or start... or ...end and it would always be obvious to the reader. But let's treat that as a fun side quest you can do if you want, rather than something I care deeply about?

[mergeconflict]

I thought about that too, actually. But I figure I should probably do that in a separate PR just to make it super obvious that I'm purely moving things here.