[breaking] Renamed gRPC field cc.arduino.cli.commands.v1.PlatformRelease.type to types

[cmaglie]

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• Tests for the changes have been added (for bug fixes / features)
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What kind of change does this PR introduce?

Fix the field name in a gRPC message. See #2504 for details.

What is the current behavior?

$ arduino-cli core list --json | jq '.platforms[4].releases."1.8.13"'
{
  "name": "Arduino SAMD (32-bits ARM Cortex-M0+) Boards",
  "version": "1.8.13",
  "type": [
    "Arduino"
  ],
  ...

What is the new behavior?

$ arduino-cli core list --json | jq '.platforms[4].releases."1.8.13"'
{
  "name": "Arduino SAMD (32-bits ARM Cortex-M0+) Boards",
  "version": "1.8.13",
  "types": [
    "Arduino"
  ],
  ...

Does this PR introduce a breaking change, and is titled accordingly?

Yes

Other information

Fix #2504

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.30%. Comparing base (81d517b) to head (fc56b44).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2620   +/-   ##
=======================================
  Coverage   70.30%   70.30%           
=======================================
  Files         222      222           
  Lines       21304    21304           
=======================================
  Hits        14977    14977           
  Misses       5151     5151           
  Partials     1176     1176           

Flag	Coverage Δ
unit	70.30% <100.00%> (ø)

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