Forward-port #8591 to dev: Akka.Hosting in the akka.net repository, net10.0 only - #8594

…steners reply OK once per forwarder (#8619)

Every Akka.Hosting.TestKit test deriving from EventFilterTestBase publishes
ForwardAllEventsTo once and waits a single 10 s for "OK". LoggingBus only
waits akka.logger-startup-timeout (5 s) for a logger's handshake before
moving on, and the logger subscribes to the EventStream only when that
handshake completes - so on a starved agent the message can be published
before the logger listens and is lost (seen on a 2-vCPU Windows agent:
EventFilterInfoTests.Can_intercept_messages_when_start_is_specified).

Core's EventFilterTestBase already retries (1 s per attempt, 200 ms apart);
the Hosting copy imported in #8594 never got that. Port it, with a 15 s
total.

Retrying means the listener can see several ForwardAllEventsTo messages
and replied OK to each, leaving a late extra "OK" in the TestActor queue
for the next ExpectMsg<LogEvent> or AfterAll's no-more-messages check to
trip on. Both listener copies (Hosting and core) now reply once per
forwarder.

Add rows for akkadotnet#8222 (Serializer overloads, ByteArraySerializer manifest),
akkadotnet#8465 (explicit TLS hostname check), akkadotnet#8132 (TCP connects bypass akka.io.dns)
and akkadotnet#7557 (object handler without predicate blocks later Receive calls).
State net10.0-only once, folding in akkadotnet#8594 and the dependency bumps; fix the
ByteString row's write types; narrow the akkadotnet#8698 row to module serializers;
drop the .Internal AddOrSet row and say why in the preamble; shorten rows;
use asterisk list markers.

…8698 (#8700)

* Audit BREAKING_CHANGES_V1.6.md against v1.5.71 and catch up through #8698

Restate the definition (binary / source / behavioral compatibility against
the last stable v1.5 release), drop rows that are not breaking under it
(Artery-only, DynamicTypeLoading-off-only, fixes, dev-only comparisons),
fold the TargetInvocationException and trim-annotation rows into one row
each, shorten the rest, mark every row Merged with its PR, and add the
breaking changes from #8694 and #8698.

* Add pre-ledger breaking changes to BREAKING_CHANGES_V1.6.md

Cover changes on dev since the v1.5 line diverged that landed before the
ledger existed: net10.0-only targeting and ByteString removal (#8132),
App.config HOCON loading removal (#7456), and the AddOrSet removal (#7622).

* Apply review feedback to BREAKING_CHANGES_V1.6.md

Add rows for #8222 (Serializer overloads, ByteArraySerializer manifest),
#8465 (explicit TLS hostname check), #8132 (TCP connects bypass akka.io.dns)
and #7557 (object handler without predicate blocks later Receive calls).
State net10.0-only once, folding in #8594 and the dependency bumps; fix the
ByteString row's write types; narrow the #8698 row to module serializers;
drop the .Internal AddOrSet row and say why in the preamble; shorten rows;
use asterisk list markers.

* Drop the #7557 ReceiveActor row from BREAKING_CHANGES_V1.6.md

The Receive(typeof(object), Func<object, bool>) regression is being fixed
in a separate PR instead of documented.