test: use integration tests from public source

[antonbaliasnikov]

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[github-actions]

Integration Test Results

11 tests  +1   11 ✔️ +9   26s ⏱️ +9s
  3 suites  - 1     0 💤 ±0 
  3 files    - 1     0 ❌ ±0 

Results for commit 5297108. ± Comparison against base commit aa120ee.

This pull request removes 6 and adds 7 tests. Note that renamed tests count towards both.

Recipient removes the last alias from keylist
Recipient sends a delivery-request message
Recipient sends a status-request message
Successful Mediation Request
Trusted ping
Wrong content type

Recipient sends a delivery-request and confirms that messages were received
Recipient sends a delivery-request message with no available forward messages
Recipient sends a delivery-request message with one forward message available
Recipient sends a status-request message with no forward message available
Recipient sends a status-request message with one forward message available
Recipient sends and receives trusted ping message with return_route "all"
Recipient sends and receives trusted ping message with return_route "none"

♻️ This comment has been updated with latest results.