Require users to opt in/out of error reporting

[hubertdeng123]

Problem Statement

self explanatory!

1. e2e tests for relay, snuba, sentry must be passing
2. force users to opt in/out for self-hosted dogfood error reporting
3. Beacon self-hosted vs dogfood prompt

Solution Brainstorm

No response

[hubertdeng123]

PR's done here:

1. (fix)e2e: Set report self hosted issues to false sentry#40422
2. (fix)e2e: Add report self hosted issues flag as env variable snuba#3282
3. (fix)e2e: Use report self hosted issues env variable relay#1539
4. ref(self-hosted): Add note to separate self-hosted error reporting and beacon reporting sentry#40531
5. Add info on self-hosted beacon develop#734
6. Enforce error reporting #1777