Remove inner exception from RMQ Logger when empty

[RafaelJCamara]

Description

There was a problem described in #2967 where an empty inner exception was being rendered.
What I've done was adjust the Count property to take the empty property into consideration.
Tests for empty and non-empty inner exceptions were added.

This is now the final result:

Fixes partially #2967

Checklist

• Is this feature complete?
  • Yes. Ready to ship.
  • No. Follow-up changes expected.
• Are you including unit tests for the changes and scenario tests if relevant?
  • Yes
  • No
• Did you add public API?
  • Yes
    • If yes, did you have an API Review for it?
      • Yes
      • No
    • Did you add <remarks /> and <code /> elements on your triple slash comments?
      • Yes
      • No
  • No
• Does the change make any security assumptions or guarantees?
  • Yes
    • If yes, have you done a threat model and had a security review?
      • Yes
      • No
  • No
• Does the change require an update in our Aspire docs?
  • Yes
    • Is this introducing a breaking change?
      • Yes
        • Link to aspire-docs issue (please use this breaking-change template):
      • No
        • Link to aspire-docs issue (please use this doc-idea template):
  • No

Microsoft Reviewers: Open in CodeFlow

[RafaelJCamara]

I solved merge conflicts on my latest commit.
Things still work as before:

[eerhardt]

LGTM. Thanks for the contribution!