Expose sentry dsn through environment variable for dashboard

[nishant-d]

Summary

Expose sentry dsn through environment variable for dashboard

Motivation

this will help us in configuring dsn through environment variable, currently its hardcoded in our code.

Proposal

expose SENTRY_DSN environment varibale like SENTRY_ENV and SENTRY_ENABLED flags

[vivek-devtron]

Merged