Improve multi-tenancy support

[AndriySvyryd]

This is a grouping of related issues. Feel free to vote (👍) for this issue to indicate that this is an area that you think we should spend time on, but consider also voting for individual issues for things you consider especially important.

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Backlog

• Named query filters #8576 would allow to add tenant filter in alongside other filters
• Make ignoring query filters more flexible #17347 would allow to ignore all tenant filters while preserving others
• EF Core Global Query Filter for SaveChanges (Update, Delete) #24122 could be used as extra protection against undesired cross-tenant data mutation
• Make it easier for library authors to integrate with an existing DbContext #30061 to allow easier customization for tenants
• As an alternative to query filters Schema-based multi-tenancy #9965 could be used
• Dynamically Connect to Multiple Databases #6089 is another alternative with even more isolation