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config: verify failover and election mode consistency

See the details in the documentation request below.

Fixes #9431

@TarantoolBot document
Title: config: failover mode and election mode consistency

`replication.failover: election` enables RAFT based leader election
mechanism on a replicaset. The instances can be configured in the
following election modes: `off`, `candidate`, `voter`, `manual`. It is
controlled by the `replication.election_mode` parameter.

However, the election mode parameter has no sense and confusing for
other failover modes (`off`, `manual`, `supervised`). So, it is
forbidden to set the election modes other than `off` in failover
modes != `election`.

Summary:

* `replication.failover: off`
  * `replication.election_mode: off`: OK
  * `replication.election_mode: candidate`: FAIL
  * `replication.election_mode: voter`: FAIL
  * `replication.election_mode: manual`: FAIL
* `replication.failover: manual`
  * `replication.election_mode: off`: OK
  * `replication.election_mode: candidate`: FAIL
  * `replication.election_mode: voter`: FAIL
  * `replication.election_mode: manual`: FAIL
* `replication.failover: election`
  * `replication.election_mode: off`: OK
  * `replication.election_mode: candidate`: OK
  * `replication.election_mode: voter`: OK
  * `replication.election_mode: manual`: OK
* `replication.failover: supervised`
  * `replication.election_mode: off`: OK
  * `replication.election_mode: candidate`: FAIL
  * `replication.election_mode: voter`: FAIL
  * `replication.election_mode: manual`: FAIL

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