Include tenant name in email notifications, if defined

[yruslan]

Background

Currently, tenant name is not part of email notifications. But when a pipeline with the same name exisits for multiple tenants, it is confusing.

Feature

Include tenant name in email notifications, if defined..

Example [Optional]

Current:

This is a notification from Pramen for TEST_PIPELINE on TEST HOST (DEV). The job has succeeded.

when

pramen.tenant = "MyApp"

then

This is a notification from Pramen for MyApp - TEST_PIPELINE on TEST HOST (DEV). The job has succeeded.

Proposed Solution [Optional]

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