ANR report should have 'was active=yes' on the dashboard

[marandaneto]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

if ANR (was active)=yes on the dashboard.

💡 Motivation and Context

the thread that reports ANRs is ANRWatchDog, so right now it's gonna be always was active=no.
as we have an ExceptionMechanismException that takes a thread, main thread in the case, we can fix this easily.

to discuss: because of the change in this PR, the selected thread on the thread selector (dashboard) will be wrong, as the thread that reported the ANR is not the thread that has a stack trace.

💚 How did you test it?

tests already exist.

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• All tests passing

🔮 Next steps

[codecov-io]

Codecov Report

Merging #299 into master will increase coverage by 0.1%.
The diff coverage is 86.66%.

@@             Coverage Diff             @@
##             master     #299     +/-   ##
===========================================
+ Coverage     58.86%   58.96%   +0.1%     
- Complexity      752      757      +5     
===========================================
  Files            86       86             
  Lines          3508     3519     +11     
  Branches        334      339      +5     
===========================================
+ Hits           2065     2075     +10     
  Misses         1294     1294             
- Partials        149      150      +1

Impacted Files	Coverage Δ	Complexity Δ
.../main/java/io/sentry/core/SentryThreadFactory.java	90.9% <100%> (+0.9%)	12 <1> (+2)	⬆️
...c/main/java/io/sentry/core/MainEventProcessor.java	76.08% <77.77%> (-0.23%)	12 <0> (+2)
...core/src/main/java/io/sentry/core/SentryEvent.java	69.91% <0%> (+0.81%)	54% <0%> (+1%)	⬆️

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[bruno-garcia]

LGTM, 1 possible improvement only