In compile command try to release the package manager lock ASAP

[cmaglie]

Please check if the PR fulfills these requirements

See how to contribute

• The PR has no duplicates (please search among the Pull Requests
  before creating one)
• The PR follows
  our contributing guidelines
• 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?

This PR fixes a concurrency problem in Compile. When a compile is run, the function will keep the Boards Manager locked for the duration of the compile. This prevents another compile from running in parallel.
This is mostly theoretical since the Arduino IDE does not allow starting two compilations together. BTW, there is another scenario that could be impacted: when the Arduino IDE starts the language server, the language server is required to run a bootstrap compilation in the background, and this compilation may prevent the user from compiling for some seconds.

What is the current behavior?

The package manager is kept locked during the whole compilation.

What is the new behavior?

The package manager is released once all information for compiling is gathered. The compilation then may run without locking the package manager.

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

No

Other information

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.54%. Comparing base (7ee4cf7) to head (6cff889).
Report is 9 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2741      +/-   ##
==========================================
- Coverage   67.62%   67.54%   -0.08%     
==========================================
  Files         237      237              
  Lines       22354    22362       +8     
==========================================
- Hits        15116    15104      -12     
- Misses       6048     6066      +18     
- Partials     1190     1192       +2     

Flag	Coverage Δ
unit	67.54% <100.00%> (-0.08%)	⬇️

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

---

🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests