fix: missing pending messages feature flag check (WPB-28301)

[sbakhtiarov]

https://wearezeta.atlassian.net/browse/WPB-28301

https://wearezeta.atlassian.net/browse/WPB-28301

What's new in this PR?

Checking pending messages feature flag to prevent resending messages when feature is disabled.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.45%. Comparing base (18b1028) to head (a64949e).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #5216   +/-   ##
========================================
  Coverage    52.45%   52.45%           
========================================
  Files          739      739           
  Lines        25702    25704    +2     
  Branches      4215     4216    +1     
========================================
+ Hits         13481    13483    +2     
  Misses       10933    10933           
  Partials      1288     1288           

Files with missing lines	Coverage Δ
.../kotlin/com/wire/android/GlobalObserversManager.kt	92.30% <100.00%> (+0.20%)	⬆️

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[github-actions]

Test Results

2 621 tests  +1   2 621 ✅ +1   1m 23s ⏱️ -2s
  333 suites ±0       0 💤 ±0 
  333 files   ±0       0 ❌ ±0 

Results for commit a64949e. ± Comparison against base commit 18b1028.

[github-actions]

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