DDM: set declarations as pending as soon as they're uploaded

[roperzh]

Similarly to what happens to profiles, we need to display the declarations as "pending" in the UI in response to various events:

• declaration uploaded or deleted via the UI
• declaration uploaded, deleted or edited via the CLI
• host transferred to a different team
• bulk transfer of hosts to a different team (separate endpoint)

Check all the instances of this function to make sure all necessary places are covered:

fleet/server/datastore/mysql/mdm.go

Lines 276 to 280 in 3d2bf66

	func (ds *Datastore) BulkSetPendingMDMHostProfiles(
	ctx context.Context,
	hostIDs, teamIDs []uint,
	profileUUIDs, hostUUIDs []string,
	) error {

[fleet-release]

Declarations pend,
Swift as a cloud's shadow,
Teams adapt, secure blend.