Move client state testing to light client module entry points

[damiannolan]

Summary

#5806 introduced the light client module interface and its associated implementations within ibc-go.

We should migrate unit tests to use the entrypoints for methods on the light client module. This should increase code coverage.
This can be broken into separate PRs for each client module. Existing tests should be refactored to use the expError error pattern in favour of expPass bool

• 06-solomachine tests: refactor solomachine tests to use light client module as entrypoint. #6038
• 07-tendermint test: move 07-tendermint client state testing to use light client module entry points #6074
• 08-wasm tests: move tests from client state to light client module for 08-wasm. #6052
• 09-localhost testing can be handled with make localhost a stateless implementation #5959

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[crodriguezvega]

I am working on the 06-solomachine tests.

[DimitrisJim]

small conflict here, had picked it up yesterday night, synced up async. Picking up solomachine and at least 08-wasm myself atm.

[DimitrisJim]

think we should just close issue with charly's PR for tendermint and leave a comment on #5959 for localhost tests.