Remove not needed instance field in LoadSketch and NewSketch gRPC API

[cmaglie]

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• Tests for the changes have been added (for bug fixes / features)
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• configuration.schema.json updated if new parameters are added.

What kind of change does this PR introduce?

Remove not needed parameters in NewSketchRequest and LoadSketchRequest gRPC API

What is the current behavior?

What is the new behavior?

No change.

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

The API is backward compatible since the removed field was never used and has been marked as reserved.

Other information

See #2203 (comment) for more context

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.07 ⚠️

Comparison is base (5725c02) 62.98% compared to head (9529b2c) 62.92%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2215      +/-   ##
==========================================
- Coverage   62.98%   62.92%   -0.07%     
==========================================
  Files         218      218              
  Lines       19466    19465       -1     
==========================================
- Hits        12261    12248      -13     
- Misses       6122     6131       +9     
- Partials     1083     1086       +3     

Flag	Coverage Δ
unit	62.92% <ø> (-0.07%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
internal/cli/sketch/new.go	93.47% <ø> (-0.14%)	⬇️

... and 1 file with indirect coverage changes

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[kittaakos]

Thank you!

Do clients still have to initialize the ArduinoCoreClient (and load the runtime tools, platforms, etc. then wait) before a NewSketchRequest or LoadSketchRequest?

[cmaglie]

Do clients still have to initialize the ArduinoCoreClient (and load the runtime tools, platforms, etc. then wait) before a NewSketchRequest or LoadSketchRequest?

No, it's not needed. It wasn't even before actually...