Remove pending tx test since test case already covered in e2e

[paologalligit]

Description

Removing the pending tx subscription test since it's already covered in e2e test suite.

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] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] New and existing E2E 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 62.58%. Comparing base (e565762) to head (5d35ed0).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #770 +/- ## ========================================== - Coverage 62.68% 62.58% -0.11% ========================================== Files 199 199 Lines 18098 18098 ========================================== - Hits 11345 11326 -19 - Misses 5669 5690 +21 + Partials 1084 1082 -2 ```

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