feat: improve Sentry logging

[bolinocroustibat]

Closes https://github.com/datagouv/data.gouv.fr/issues/1389:

• Update Sentry module and fix deps conflicts (see note)
• Send environment (using SITE_ID) and release info to Sentry
• Send profiling and traces to Sentry for performance analyzing
• Add an app-scoped config var SENTRY_SAMPLE_RATE

Note: This PR adds sentry-sdk[flask] as an install dependency. I'm not sure why it wasn't there before - let me know if this is a mistake! So since sentry-sdk[flask] depends on urllib3 and urllib3 depends on requests which were incompatible with newer versions of sentry-sdk, both pinned versions of urllib3 and requests have been updated in this PR.

[bolinocroustibat]

Thank you! We can probably test it on our dev envs :)

Don't forget to add a changelog entry ;)

Indeed. Added a changelog entry.