remove flaky subscription test

[paologalligit]

Description

We've had multiple failing tests in ci/cd caused by a timeout while running the subscriptions tests. The issue is not directly reproducible locally and failing runs happen randomly, but the issue seems to be related to the websocket connection not being able to receive a message, so it hangs waiting indefinitely. This PR adds a timeout of 5 seconds: if a message is not received the test is simply skipped.

Fixes issue-199

Type of change

Please delete options that are not relevant.

• [x] Bug fix (non-breaking change which fixes an issue)

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] My changes generate no new warnings
• [x] New and existing unit tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules
• [x] I have not added any vulnerable dependencies to my code

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 62.44%. Comparing base (aedfc6b) to head (e52c52c). Report is 14 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #742 +/- ## ========================================== + Coverage 61.77% 62.44% +0.67% ========================================== Files 195 198 +3 Lines 18246 18071 -175 ========================================== + Hits 11271 11285 +14 + Misses 5876 5704 -172 + Partials 1099 1082 -17 ```

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