Cancel all spans when user goes to background

[rlinoz]

Problem:
When users put the app in background, if a span is started, then when the user opens the app again the span will end successfully and will have a duration way longer than it should, making our metrics wrong.

Solution:
Cancel all running spans when the app is put in background.

[adhorodyski]

I will work on that.

[adhorodyski]

Opened a draft PR, will have to test against Sentry (local tests are ok) #81075