Fix CI check and remove try-runtime command (#3046)

* CI: Fix check-try-runtime

(preparation for the monorepo)

Warnings should be treated as errors here, since this is how it will
be done in the monorepo.
I expect to see two errors in this check now.

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Allow deprecated

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Remove try-runtime command

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* make it compile

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Remove try-runtime-cli dependency

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

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Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>