Propagate cancellation tokens through persistence dialects, licensing and acceptance test infrastructure

[johnsimons]

Retires the cancellation analyzer debt blocks in six projects, which is
Phase 7 of the propagation work.

ServiceControl.Persistence.EFCore.SqlServer / .PostgreSql: the dialect
implementations now match their interfaces, whose tokens are already
optional.

ServiceControl.RavenDB: EmbeddedDatabase.DeleteDatabase takes a token and
forwards it, so deleting a database can be cancelled.

Particular.LicensingComponent: IAuditQuery and IThroughputCollector and
their implementations, plus BrokerThroughputCollectorHostedService's
stoppingToken renamed to cancellationToken. Five catch blocks now catch
OperationCanceledException filtered on the token before catching
Exception, so shutdown cancellation is no longer reported as a failure to
gather throughput or to reach the audit remotes.

ServiceControl.AcceptanceTesting: the HTTP helpers and assertion helpers
take and forward optional tokens. The scenario poll loop captured
cancellation as a test failure on shutdown, so it now swallows its own
cancellation and holds the linked token in a local rather than reading a
disposed source. The project block is narrowed to the types that sit on
NServiceBus.AcceptanceTesting extension points, which drive them without
a token.

ServiceControl.Audit.Persistence.RavenDB: the PS0020 carve-out on
LicenseStatusCheck moves from the project editorconfig to an inline
pragma. The filter is deliberate, since the try runs on a linked token
that is always cancelled in the timeout case being mapped.