Fix v1 Go tests sometimes failing with `could not stay in the group because member...`

[michalinacienciala]

The keep-core Go workflow has failed with following errors:

=== Failed
=== FAIL: pkg/beacon/relay/gjkr TestExecute_DQ_member2_invalidMessage_phase8 (unknown)
=== FAIL: pkg/beacon/relay/gjkr TestExecute_DQ_member2_accusesInactiveMember_phase9 (unknown)
=== FAIL: pkg/beacon/relay/gjkr TestExecute_DQ_member2_revealedKeyOfOperatingMember_phase11 (unknown)
failed with: [[member:4] could not stay in the group because member is considered as misbehaving]
failed with: [[member:5] could not stay in the group because member is considered as misbehaving]
panic: send on closed channel
goroutine 52883 [running]:
github.com/keep-network/keep-core/pkg/beacon/relay/dkg/result.(*SubmittingMember).SubmitDKGResult.func1(0xc000504940)
	/go/src/github.com/keep-network/keep-core/pkg/beacon/relay/dkg/result/submission.go:[74](https://github.com/keep-network/keep-core/runs/6839544867?check_suite_focus=true#step:7:75) +0x3a
github.com/keep-network/keep-core/pkg/chain/local.(*localChain).SubmitDKGResult.func1(0xc000504940, 0xc0008[76](https://github.com/keep-network/keep-core/runs/6839544867?check_suite_focus=true#step:7:77)2e0, 0xc000504940)
	/go/src/github.com/keep-network/keep-core/pkg/chain/local/local.go:446 +0x30
created by github.com/keep-network/keep-core/pkg/chain/local.(*localChain).SubmitDKGResult
	/go/src/github.com/keep-network/keep-core/pkg/chain/local/local.go:445 +0x4[79](https://github.com/keep-network/keep-core/runs/6839544867?check_suite_focus=true#step:7:80)
=== FAIL: pkg/beacon/relay/gjkr TestExecute_DQ_members25_revealWrongPrivateKey_phase9 (unknown)
=== FAIL: pkg/beacon/relay/gjkr TestExecute_DQ_members14_invalidPublicKeyShare_phase9 (unknown)
=== FAIL: pkg/beacon/relay/gjkr TestExecute_DQ_member5_revealsWrongPrivateKey_phase11 (unknown)
failed with: [[member:2] could not stay in the group because member do not support the same group public key]
failed with: [[member:1] could not stay in the group because member do not support the same group public key]
=== FAIL: pkg/beacon/relay/gjkr TestExecute_DQ_member4_falseAccusation_phase9 (unknown)
=== FAIL: pkg/beacon/relay/gjkr TestExecute_DQ_members12_cannotDecryptTheirShares_phase9 (unknown)

Workflow: https://github.com/keep-network/keep-core/runs/6839544867?check_suite_focus=true.

This isn't the first time we see similar errors (although they don't occur often). Last time we discussed this it was concluded that:

"We need to solve the first one but we don't have any spare cycles at the moment 😦 it's something about libp2p upgrade [...] It could be something about the unit test or something about the channel implementation."

[michalinacienciala]

Another execution with similar failure (no could not stay in the group because member is considered as misbehaving, but there was the could not stay in the group because member do not support the same group public key error in there): https://github.com/keep-network/keep-core/runs/7103196422?check_suite_focus=true.