Initialize Logback after context refreshes.

[maciejwalkowiak]

📜 Description

Spring Context can be refreshed while application is running (for example using Spring Cloud Bus). Without this change, SentryAppender would not get registered once refresh happens.

💡 Motivation and Context

#1128

💚 How did you test it?

AFAIK It is not possible to trigger context refresh in Spring integration testing framework.

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• All tests passing
• No breaking changes

[codecov-io]

Codecov Report

Merging #1129 (270d561) into main (671f9e0) will increase coverage by 0.86%.
The diff coverage is 96.42%.

@@             Coverage Diff              @@
##               main    #1129      +/-   ##
============================================
+ Coverage     74.34%   75.21%   +0.86%     
- Complexity     1592     1603      +11     
============================================
  Files           163      165       +2     
  Lines          5617     5567      -50     
  Branches        574      547      -27     
============================================
+ Hits           4176     4187      +11     
+ Misses         1164     1128      -36     
+ Partials        277      252      -25     

Impacted Files	Coverage Δ	Complexity Δ
...o/sentry/spring/boot/SentryLogbackInitializer.java	96.15% <96.15%> (ø)	10.00 <10.00> (?)
...g/boot/SentryLogbackAppenderAutoConfiguration.java	100.00% <100.00%> (ø)	2.00 <2.00> (-6.00)
sentry/src/main/java/io/sentry/Stack.java	92.10% <0.00%> (ø)	8.00% <0.00%> (?%)
sentry/src/main/java/io/sentry/Hub.java	75.22% <0.00%> (+9.90%)	70.00% <0.00%> (-1.00%)	⬆️

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[marandaneto]

should we add a changelog? if it fixes a bug, I'd say it's worth it.

[marandaneto]

LGTM