feat(HMSPROV-2088): refacor notification's context message

[amirfefer]

Currently, we send the generic reservation payload as the notification's context. some data is redundant (i.e. step titles, steps/step) others misleading (i.e. success flag), or might confuse - the provider's id (2) instead of the provider's string (aws).

We should send the minimal information that also will be beneficial,
This PR replaces the reservation's payload with the NotificationContext struct which includes the launch_id and the provider's string, both are used in email templates.

[adiabramovitch]

linter issues

[amirfefer]

there are no linter issues, it was a timeout issue

[lzap]

Once per month, the linter github action is configured to delete cache which leads to linter exceeding 5 minutes limit on GHA which leads to a failure.