Revert "Remove the telecom company from Contract"

See merge request coopdevs/contract_changes_wizards_somconnexio!30

This reverts commit ccee15a3.

Update change address wizard

See merge request coopdevs/contract_changes_wizards_somconnexio!29

Provider refers the SC providers (Jazztel, Vdf and MM) to know where
type of service had previously.

Add a notes field in the Change address wizard to save in the new order

See merge request coopdevs/contract_changes_wizards_somconnexio!28

Fix/change holder service

See merge request coopdevs/contract_changes_wizards_somconnexio!27

Fix/change address fields visibility required

See merge request coopdevs/contract_changes_wizards_somconnexio!26

Add change address boolean to order

See merge request coopdevs/contract_changes_wizards_somconnexio!25

Add coverage fields to the Change Address wizard

See merge request coopdevs/contract_changes_wizards_somconnexio!20

Also we test that the value assigned to these fields are the expected.

Suggestion of @sauloperez and @gerard.funosas in
https://gitlab.com/coopdevs/contract_changes_wizards_somconnexio/-/merge_requests/20#note_338063780

In change address wizard we create a new order to start the provision
process in the new place. We add this flag to the new order to be
processed as a change address and not like a new service order.

Move the logic to change contract address to a new service and execute
it from the wizard transition.

Prepare release 0.4.0

See merge request coopdevs/contract_changes_wizards_somconnexio!24

Track errors in Bugsnag project

See merge request coopdevs/contract_changes_wizards_somconnexio!22