Rename proxy deployment service to v1

[josemigallas]

What this PR does / why we need it:

This is a simple refactorization.

ProviderProxyDeploymentService handles only APIcast v1 deployments and this is going to be removed soon. In order to make a new service for v2, this one is to be renamed to ProxyDeploymentServiceV1. This way it will be easier to remove and also we won't mix responsibilities.

Which issue(s) this PR fixes

Works towards THREESCALE-3751: Tech-Debt: Create a Proxy Deployment Service, but doesn't fix it.

Verification steps

Everything deployment-wise should work the same.

[codecov]

Codecov Report

Merging #1469 into master will increase coverage by 2.66%.
The diff coverage is 80%.

@@            Coverage Diff             @@
##           master    #1469      +/-   ##
==========================================
+ Coverage   89.77%   92.43%   +2.66%     
==========================================
  Files        2185     2355     +170     
  Lines       67076    75774    +8698     
==========================================
+ Hits        60215    70044    +9829     
+ Misses       6861     5730    -1131

Impacted Files	Coverage Δ
...admin/onboarding/wizard/request_controller_test.rb	100% <ø> (ø)
app/workers/proxy_deployment_worker.rb	17.39% <0%> (ø)	⬆️
test/unit/proxy_test.rb	100% <100%> (ø)	⬆️
...vices/provider_proxy_deployment_v1_service_test.rb	100% <100%> (ø)
...p/services/provider_proxy_deployment_v1_service.rb	90.9% <100%> (ø)
app/models/proxy.rb	97.77% <66.66%> (ø)	⬆️
app/mailers/data_export_mailer.rb	40% <0%> (-60%)	⬇️
app/workers/last_traffic_worker.rb	46.15% <0%> (-53.85%)	⬇️
app/workers/purge_stale_objects_worker.rb	50% <0%> (-50%)	⬇️
app/workers/data_exports_worker.rb	50% <0%> (-50%)	⬇️
... and 1044 more

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[guicassolato]

This is a first step into defining a new ProviderProxyDeploymentService. When we finally drop support for apicast v1, this service will be removed as stated in the description of the PR.

[Martouta]

https://github.com/3scale/porta/pull/1469/files#r354235871 is important 😄

Everything else is good 👍

[Martouta]

👍