channel/v2: Add Keeper Tests

[AdityaSripal]

Description

closes: #7443

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[AdityaSripal]

Note: I also changed the timeout handling to seconds in this PR

[AdityaSripal]

I noticed that the packet and msg_server files are using a mix of errors from the v2/types package and the original types package.

Think we need to make a consistent decision and go with that. Think it should all just use v2/errors so we're not importing from channel/v1 at all. Will make an issue to address in separate PR

[sonarcloud[bot]]

Quality Gate failed for 'ibc-go'

Failed conditions
63.8% Coverage on New Code (required ≥ 80%)

See analysis details on SonarCloud

[AdityaSripal]

I believe the test cov is failing because I removed packet-server/relay_test.go without removing relay.go. Think the deletion of packetserver should happen in a new PR hence the issue #7477