Fix rendezvous bypass mode

[pan-apple]

Problem

Rendezvous bypass mode is not working. It's failing in establishing the secure session.

Summary of Changes

Recent controller changes mixed using test secret with non-test pairing. This change makes sure that the test secret is used for establishing the secure session when bypass mode is being used.

Fixes #6578

[tcarmelveilleux]

Suggest adding handling of better error message for:

VerifyOrExit(peerAddress.GetTransportType() == Transport::Type::kUdp, err = CHIP_ERROR_INVALID_ARGUMENT);

to make clear that PairTestDeviceWithoutSecurity is BLE-only

[kianooshkarami]

Suggest adding handling of better error message for:

VerifyOrExit(peerAddress.GetTransportType() == Transport::Type::kUdp, err = CHIP_ERROR_INVALID_ARGUMENT);

to make clear that PairTestDeviceWithoutSecurity is BLE-only

@tcarmelveilleux I am a bit confused by your comment about PairTestDeviceWithoutSecurity being BLE-only, did you mean UDP-Only?

[kianooshkarami]

Thanks for fixing this issue