Multiple modules with Sagas with same name raise errors

[SkyaTura]

I'm submitting a...

[ ] Regression 
[x] Bug report
[ ] Feature request
[ ] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead post your question on Stack Overflow.

Current behavior

If a project has two modules, when both contain a Saga with the same name, nestjs won't start.

Expected behavior

It should work properly.

Minimal reproduction of the problem with instructions

• Create a project with two modules in it
• Create a Saga in both modules and same name, eg.: CreateUserSaga

What is the motivation / use case for changing the behavior?

Solving a bug.

Environment

Nest version: 7.6.15


For Tooling issues:
- Node version: 14.15.4  
- Platform:  Mac

Others:

[SkyaTura]

https://github.com/nestjs/cqrs/blob/8e24dd7acb0d7ea95d2993cd193f2189af06be1f/src/event-bus.ts#L76

I found that in this line, the instance variable may not being correct when two modules have the same name.

[kamilmysliwiec]

This should be fixed in v8