[BREAKING] Add protoc oneof clause where appropriate.

[cmaglie]

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• The PR has no duplicates (please search among the Pull Requests
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• The PR follows
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• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• UPGRADING.md has been updated with a migration guide (for breaking changes)
• configuration.schema.json updated if new parameters are added.

What kind of change does this PR introduce?

Add protoc oneof clause where appropriate.

What is the current behavior?

No change

What is the new behavior?

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

Yes.

Other information

Fix #2593

[alessio-perugini]

Awesome 🤩

[codecov]

Codecov Report

Attention: Patch coverage is 86.95652% with 24 lines in your changes are missing coverage. Please review.

Project coverage is 70.26%. Comparing base (8b78c05) to head (8290196).

Files	Patch %	Lines
commands/service_debug_run.go	0.00%	12 Missing ⚠️
commands/service_debug.go	0.00%	5 Missing ⚠️
commands/service_monitor.go	33.33%	3 Missing and 1 partial ⚠️
commands/service_library_uninstall.go	72.72%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2608      +/-   ##
==========================================
+ Coverage   70.11%   70.26%   +0.14%     
==========================================
  Files         222      222              
  Lines       21124    21262     +138     
==========================================
+ Hits        14812    14939     +127     
- Misses       5135     5147      +12     
+ Partials     1177     1176       -1     

Flag	Coverage Δ
unit	70.26% <86.95%> (+0.14%)	⬆️

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