✨ Fix Testimonial Auto-Share Sequence During Creation

[abdullai-t]

Summary / Highlights

This PR addresses an issue where testimonials were being shared with communities prematurely during their creation process. The function used to fetch communities for auto-sharing was called before assigning the community to the testimonial.

Details (Give details about what this PR accomplishes, include any screenshots etc)

Testing Steps (Provide details on how your changes can be tested)

Requirements (place an x in each [ ])

• [x] I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• [x] I've tested my changes manually.
• [ ] I've added unit tests to my PR.

Transparency (Project board)

• [x] I've given my PR a meaningful title.
• [x] I linked this PR to the relevant issue.
• [ ] I moved the linked issue from the "Sprint backlog" to "In progress" when I started this.
• [ ] I moved the linked issue to "QA Verification" now that it is ready to merge.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 96.36364% with 2 lines in your changes missing coverage. Please review.

Project coverage is 57.20%. Comparing base (408c74f) to head (6061ac3). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/api/store/testimonial.py	66.66%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1179 +/- ## ========================================== + Coverage 57.13% 57.20% +0.06% ========================================== Files 485 486 +1 Lines 35742 35791 +49 ========================================== + Hits 20420 20473 +53 + Misses 15322 15318 -4 ```

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